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Web Cache Communication Protocol Version 2

Web Cache Communication Protocol Version 2

This chapter describes the Web Cache Communication Protocol (WCCP) Version 2 feature. It includes information on the benefits of this feature, supported platforms, and other information you may need to work with WCCP Version 2. This chapter includes the following sections:

Feature Overview

Cisco developed the Web Cache Communication Protocol (WCCP) within Cisco IOS software to enable routers or switches to transparently redirect packets to network appliances. It does not interfere with normal router or switch operations. Using WCCP, the router redirects requests on configured TCP and UDP ports to network appliances rather than to intended host sites. It also balances traffic load across a group of appliances (a cluster) and ensures fault-tolerant and fail-safe operation. As Content Routers are added to or deleted from a appliance cluster, the WCCP-aware router or switch dynamically adjusts its redirection map to reflect the currently available appliances, resulting in maximized performance and content availability.

WCCP Version 2 contains the following features:

Multirouter Support

WCCP Version 2 enables a series of Content Routers, called a Content Router cluster, to connect to multiple routers. This feature provides redundancy and a more distributed architecture for instances when a Content Router needs to connect to a large number of interfaces. This strategy also has the benefit of keeping all the Content Routers in a single cluster.

How WCCP Version 2 Works

With WCCP Version 2, multiple routers can service a cluster. This allows any of the available routers in a service group to redirect packets to each of the Content Routers in the cluster. Figure A-1 illustrates how this configuration appears.


Figure A-1: Content Router Network Configuration Using WCCP Version 2


You can configure the router to run DNS boomerang (service number 50), a service that sends DNS Address (DNS A) record requests to a Content Router.

The subset of Content Routers within a cluster and routers connected to the cluster that are running the same service is known as a service group.

WCCP Version 2 addresses the issue of multiple routers being available to the cluster by allowing either a list of routers or an IP multicast address to be created on the Content Router. The difference in these two strategies is as follows:

If you are adding and removing routers dynamically, the multicast address strategy provides for easier configuration because you do not need to change the configuration for each device in the WCCP network.

The following sequence of events details how this process works:

    1. Instead of having one central "home router," each Content Router defines a list of routers and stores the list in its memory.

    2. Each Content Router announces its presence and view of the service group to the list of router IP addresses with which it has been configured. The routers reply with their view, which is a list of Content Router addresses in the group.

    3. Once the view is consistent across all Content Routers in the cluster, one Content Router is designated the lead and sets the policy that the routers need to deploy in redirecting packets.

Also, you must perform these tasks to configure the routers that will become members of the service group:

For network configurations in which the Content Router sends to a target router a packet that needs to traverse an intervening router, the router being traversed must be configured to perform IP multicast routing. You must configure two components to enable traversal over an intervening router:

How Routers and Content Routers Communicate

Routers and Content Routers become aware of one another and form a service group using a management protocol. Once the service group has been established, one of the Content Routers is designated to determine load assignments among the Content Routers.

If there is a group of Content Routers, the one seen by all routers and the one that has the lowest IP address becomes the lead Content Router. The role of this Content Router is to determine how traffic should be allocated across Content Routers. The assignment information is passed to the entire service group from the designated Content Router so that the routers of the group can redirect the packets properly and the Content Routers of the group can manage their load better.

Improved Security

WCCP Version 2 provides authentication that enables you to control which routers and Content Routers become part of the service group. You use passwords and the HMAC MD5 standard set by the ip wccp [password [0-7] password] command to control service group membership.

Faster Throughput

Cisco Express Forwarding (CEF) has been integrated into WCCP Version 2 and provides fast packet redirection.

Redirection for Multiple TCP and UDP Port-Destined Traffic

WCCP Version 2 enables more TCP and UDP ports to have traffic redirected to the Content Router. Previously, Web-cached information could be redirected only if it was destined for TCP port 80. Many applications require packets intended for other ports to be redirected, for example, proxy-Web cache handling, FTP caching, FTP proxy handling, Web caching for ports other than 80, and RealAudio, video, and telephony applications. A UDP port is used for the interception of DNS packets for content routing.

Packets that the Content Routers do not service are tunneled back to the same router from which they were received. When a router receives a formerly redirected packet, it knows not to redirect it again.

The criteria for determining whether to redirect the traffic are:

Note that service information has been added to the protocol to indicate which service the WCCP messages refer to. This information is used to help verify that service group members are all using or providing the same service.

Web Cache Packet Return

WCCP Version 2 filters packets to determine which redirected packets have been returned from the Content Router and which ones have not. It does not redirect the ones that have been returned because the Content Router has determined that the packets should not be routed. WCCP Version 2 returns packets that the Content Router does not service to the same router from which they were transmitted. Typical reasons why a Content Router would reject packets and initiate packet return are:

Load-Distributing Applications

WCCP Version 2 has the capability to adjust the load being offered to individual Content Routers to provide more effective use of the resources available and at the same time help to ensure high quality of service to the clients. It uses three techniques to perform this task:

Restrictions

The following limitations apply to WCCP Version 2:

Related Documents

Supported Platforms

WCCP is implemented within "software-switching" paths of all of the supported platforms shown in Table A-1. It is available for process-, fast- and CEF-based forwarding paths. IOS software Release 12.0(11)S introduces a distributed CEF (dCEF) implementation for 75xx+VIP environments.

The Cisco Content Router 4400 supports only WCCP Version 2.


Table A-1: Supported Platforms and IOS Versions
Platform IOS 11.1 CA IOS 11.2 P IOS 12.0(3)T IOS 12.0(5)T

Cisco 1600/1700

n/a

n/a

n/a

v21

Cisco 2500 series

v12

v1

v2

v1/v2

Cisco 4000 series

v1

v1

v2

v1/v2

Cisco 4500 series

v1

v1

v2

v1/v2

Cisco 4700 series

v1

v1

v2

v1/v2

Cisco 5200 series

n/a

Cisco 5300 series

n/a

Cisco 6400 series

Cisco 7200 series

v1

v1

v2

v1/v2

Cisco 7500 series

v1

v1

v1

v1/v2

Catalyst RSM

Catalyst MSFC

1v2 = WCCP Version 2
2v1 = WCCP Version 1

Supported Standards, MIBs, and RFCs

Standards

For descriptions of supported MIBs and how to use MIBs, see Cisco's MIB Web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.

MIBs

None

RFCs

None

Prerequisites

Before you use WCCP Version 2, you must complete the following tasks:

Router Configuration Tasks

You can configure a router to run the DNS boomerang, custom Web cache, and reverse proxy services associated with WCCP Version 2. The services can be configured simultaneously. Perform the following tasks to configure a cluster with multiple routers.

Configuring a Service Group Using WCCP Version 2

Command Purpose

Step 1 

Router(config)#  ip wccp {web-cache | service-number} [group-address groupaddress] [redirect-list access-list] [group-list access-list] [password [0-7] password]

Turns the WCCP feature on or off for the specified service.

Step 2 

Router(config-if)#  ip wccp {web-cache | service-number} redirect out

Specifies "out" because in the future, WCCP may have the ability to redirect incoming packets as well as outgoing packets.

Step 3 

Router(config-if)#  ip wccp redirect exclude in

Allows inbound packets on this interface to be excluded from redirection.

Running the DNS Boomerang Service

Command Purpose

Step 1 

Router(config)# ip wccp 50

Turns on the protocol for DNS packet redirection.

Step 2 

Router(config)# interface type-number

Specifies an interface for packet redirection.

Step 3 

Router(config-if)# ip wccp 50 redirect out

Enables the check on packets to determine whether they need to be redirected to a Content Router.

Registering a Router to a Multicast Address

Command Purpose

Step 1 

Router(config)#  ip wccp 50 group-address groupaddress

Configures the group address for the service group.

Step 2 

Router(config)# interface type-number

Specifies an interface that will listen for the multicast address. (For example, Eth 0, Eth0, Ser 0, Ser0, Eth 0/0.)

Step 3 

Router(config-if)# ip wccp 50 group-listen

Configures an interface on a router to enable or disable the reception of IP multicast packets for WCCP.

Informing a Router of Valid IP Addresses

Command Purpose

Step 1 

Router(config)# ip wccp 50 group-list access-list

Indicates to the router which Content Router IP addresses to allow packets from.

Step 2 

Router(config)# access-list access-list number permit host host-address

Creates an access list that enables or disables traffic redirection to the Content Router.

Setting a Password for a Router and Content Routers

Command Purpose

Step 1 

Router(config)# ip wccp 50 password [0-7] password

Sets a password for the Content Router that the router is trying to access.

Disabling Caching for Certain Clients

Command Purpose

Step 1 

Router(config)# ip wccp 50 redirect-list access-list number

Sets the access list used to enable redirection.

Step 2 

Router(config)# access-list access-list number deny host host-address

Creates an access list that enables or disables traffic redirection to the Content Router.

Verifying WCCP Configuration Settings


Step 1   To view the configuration, enter the show running-config command.

A sample configuration follows:

Console# show running-config Building configuration... Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname router4 ! enable secret 5 $1$nSVy$faliJsVQXVPW.KuCxZNTh1 enable password alabama1 ! ip wccp subnet zero ip wccp 50 ip domain-name cisco.com ip name-server 10.1.1.1 ip name-server 10.1.1.2 ip name-server 10.1.1.3 ! ! ! interface Ethernet0 ip address 10.3.1.2 255.255.255.0 no ip directed-broadcast ip wccp 50 redirect out no ip route-cache no ip mroute-cache ! interface Ethernet1 ip address 10.4.1.1 255.255.255.0 no ip directed-broadcast no ip route-cache no ip mroute-cache ! interface Serial0 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache shutdown ! interface Serial1 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache shutdown ! ip default-gateway 10.3.1.1 ip classless ip route 0.0.0.0 0.0.0.0 10.3.1.1 no ip http server ! ! ! line con 0 transport input none line aux 0 transport input all line vty 0 4 password alaska1 login ! end

Step 2   To view values associated with WCCP variables, enter the show ip wccp command. The following output is displayed:

Console# show ip wccp Global WCCP Information: Service Name: 50 Number of Content Routers:1 Number of Routers:2 Total Packets Redirected:198 Redirect access-list:-none- Total Packets Denied Redirect:0 Total Packets Unassigned:0 Group access-list:11 Total Messages Denied to Group:0 Total Authentication failures:0

Monitoring and Maintaining WCCP Version 2 Usage

Command Purpose
Router# show ip wccp

or

Router# show ip wccp {web-cache | 0-99}

Displays global statistics related to WCCP.

Router# show ip wccp {web-cache | 0-99} detail

Queries the router for information about which Content Routers the router has detected in a specific service group. The information can be displayed for either a Web cache or another service, which is indicated by a value of 99.

Router# show ip interface

Shows whether any ip wccp direct commands are configured on an interface.

Router# show ip wccp {web-cache | 99} view

Displays which devices in a particular service group have been detected and which Content Routers are not visible to all other routers to which the current router is connected. The information can be displayed for either a Web cache or another service.

Router Configuration Examples

This section provides the following configuration examples:

Running the DNS Boomerang Service

The following example shows a Web cache service configuration session:

configure terminal ip wccp service 50 interface ethernet 0 ip wccp 50 redirect out

Registering a Router to a Multicast Address

The following example shows how to register a router to a multicast address of 192.168.1.1:

configure terminal ip wccp 50 group-address 192.168.1.1 interface ethernet 0 ip wccp 50 group-listen

Informing a Router of Valid IP Addresses

To achieve better security, you can use a standard access list to notify the router which IP addresses are valid addresses for a Content Router attempting to register with the current router. The following example shows a standard access list configuration session where the access list number is 10 for some sample hosts:

configure terminal access-list 10 permit host 10.1.1.1 access-list 10 permit host 10.1.1.2 access-list 10 permit host 10.1.1.3 ip wccp 50 group-list 10

Setting a Password for a Router and Content Routers

The following example shows a WCCP Version 2 password configuration session in which the password is alabama2:

configure terminal ip wccp 50 password alabama2

Disabling Caching for Certain Clients

To disable caching for certain clients, servers, or client/server pairs, you can use WCCP access lists. The following example shows any requests coming from 10.1.1.1 or going to 10.2.2.2 will bypass the cache, whereas all other requests will be serviced normally:

configure terminal ip wccp 50 redirect-list 120 access-list 120 deny host 10.1.1.1 access-list 120 deny host 10.2.2.2 access-list 120 permit host 10.1.1.3

Displaying WCCP Settings

The following example displays WCCP settings, using the show running-config command:

Console# show running-config Building configuration... Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname router4 ! enable secret 5 $1$nSVy$faliJsVQXVPW.KuCxZNTh1 enable password alabama1 ! ip subnet-zero ip wccp 50 ip domain-name cisco.com ip name-server 10.1.1.1 ip name-server 10.1.1.2 ip name-server 10.1.1.3 ! ! ! interface Ethernet0 ip address 10.3.1.2 255.255.255.0 no ip directed broadcast ip wccp 50 redirect out no ip route-cache no ip mroute-cache ! interface Ethernet1 ip address 10.4.1.1 255.255.255.0 no ip directed-broadcast no ip route-cache no ip mroute-cache ! interface Serial0 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache shutdown ! interface Serial1 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache shutdown ! ip default-gateway 10.3.1.1 ip classless ip route 0.0.0.0 0.0.0.0 10.3.1.1 no ip http server ! ! ! line con 0 transport input none line aux 0 transport input all line vty 0 4 password alaska1 login ! end

Command Reference

This section documents new or modified commands that configure the WCCP Version 2 feature.

In Cisco IOS Release 12.0(1)T or a later release of 12.0 T, you can search and filter the output for show and more commands. This functionality is useful when you need to sort through large amounts of output, or if you want to exclude output that you do not need to see.

To use this functionality, enter a show or more command followed by the "pipe" character (|), one of the keywords begin, include, or exclude, and an expression that you want to search or filter on:

command | {begin | include | exclude} regular-expression

Following is an example of the show atm vc command in which you want the command output to begin with the first line where the expression "PeakRate" appears:

show atm vc | begin PeakRate

For more information on the search and filter functionality, refer to the Cisco IOS Release 12.0(1)T feature module titled CLI String Search.

clear ip wccp

To remove Web Cache Communication Protocol (WCCP) statistics maintained on the router either for a particular service or for all the services, use the clear ip wccp EXEC command.

clear ip wccp {web-cache | service-number}

Syntax Description

web-cache

Directs the router to remove statistics for the Web cache service.

service-number

Directs the router to remove statistics for a specified Web cache service. The number can be from 0 to 99. The DNS boomerang service is indicated by a value of 50.

Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release Modification

11.1 CA

This command was introduced.

11.2 P

This command was introduced.

12.0(3)T

This command has been expanded to be explicit about service.

Usage Guidelines

Use the show ip wccp and show ip wccp detail commands to display WCCP statistics.

Examples

clear ip wccp 50

Related Commands

ip wccp

show ip wccp

ip wccp

To direct a router to enable or disable the support for a Content Router service group, use the ip wccp global configuration command. To remove the ability of a router to control support for a service group, use the no form of this command.

ip wccp {web-cache | service-number} [group-address groupaddress] [redirect-list access-list] [group-list access-list] [password [0-7] password]

no ip wccp {web-cache | service-number} [group-address groupaddress] [redirect-list access-list] [group-list access-list] [password [0-7] password]

Syntax Description

web-cache

Enables the Web cache service.

service-number

The identification number of the Web Cache Communication Protocol (WCCP) service being controlled by a router. The number can be from 0 to 99. The DNS boomerang service is indicated by a value of 50.

group-address

(Optional.) Directs the router to use a specified multicast IP address for communication with the WCCP service group.

groupaddress

(Optional.) A multicast address used by the router to determine which Content Router should receive redirected messages.

redirect-list

(Optional.) Directs the router to use an access list to control traffic redirected to this service group.

access-list

(Optional.) A string (not to exceed 64 characters) that is the name of the access list that determines which traffic is redirected to a Content Router.

group-list

(Optional.) Directs the router to use an access list to determine which Content Routers are allowed to participate in the service group.

access-list

(Optional.) A string (not to exceed 64 characters) that is the name of the access list that determines which Content Routers are allowed to participate in the service group.

password

(Optional.) A string that directs the router to apply MD5 authentication to messages received from the service group specified by the service name given. Messages that are not accepted by the authentication are discarded.

0-7

(Optional.) A value that indicates the HMAC MD5 algorithm used to encrypt the password. This value is generated when an encrypted password is created for the Content Router.

password

(Optional.) The password name that is combined with the HMAC MD5 value to create security for the connection between the router and the Content Router.

Defaults

This command is disabled by default.

Command Modes

Global configuration

Command History

Release Modification

12.0(3)T

This command was introduced.

Examples

The following example shows a router configured to run WCCP DNS boomerang service, using (listening to) the multicast address of 192.168.1.2:

ip wccp 50 group-address 192.168.1.2

Related Commands

ip wccp group-listen

ip wccp group-listen

To configure an interface on a router to enable or disable the reception of IP multicast packets for the Web Cache Communication Protocol (WCCP) feature, use the ip wccp group-listen interface configuration command. To remove control of the reception of IP multicast packets for the WCCP feature, use the no form of this command.

ip wccp {web-cache | service-number} group-listen

no ip wccp {web-cache | service-number} group-listen

Syntax Description

web-cache

Directs the router to transmit packets to the Web cache service.

service-number

Identification number of the Content Router service group being controlled by a router. The number can be from 0 to 99. The DNS boomerang service is indicated by a value of 50.

Defaults

This command is disabled by default.

Command Modes

Interface configuration

Command History

Release Modification

12.0(3)T

This command was introduced.

Examples

The following example shows that multicast packets have been enabled for DNS boomerang with an address of 192.168.1.2.

configure terminal ip wccp 50 group-address 192.168.1.2 interface ethernet 0 ip wccp 50 group-listen

Related Commands

ip wccp

ip wccp redirect out

ip wccp redirect exclude in

To configure an interface to enable or disable excluding packets received on an interface from being redirected to a Content Router, use the ip wccp redirect exclude in interface configuration command. To disable a router's ability to verify that only appropriate packets are being redirected to a Content Router, use the no form of this command.

ip wccp redirect exclude in

no ip wccp redirect exclude in

Syntax Description

This command has no arguments or keywords.

Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release Modification

12.0(3)T

This command was introduced.

Usage Guidelines

Note that the command is global to all the services and should be applied to any inbound interface that has been configured to be excluded from redirection on an outbound interface that the traffic will traverse.

Examples

configure terminal ip wccp 50 interface ethernet0 ip wccp redirect exclude in

Related Commands

ip wccp

ip wccp redirect out

ip wccp redirect out

To configure an interface to enable a router's ability to verify that appropriate packets are being redirected to a Content Router, use the ip wccp redirect out interface configuration command. To disable a router's ability to verify that only appropriate packets being redirected to a Content Router, use the no form of this command.

ip wccp {web-cache | service-number} redirect out

no ip wccp {web-cache | service-number} redirect out

Syntax Description

web-cache

Enables the Web cache service.

service-number

The identification number of the Content Router service group being controlled by a router. The number can be from 0 to 99. The DNS boomerang service is indicated by a value of 50.

Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release Modification

12.0(3)T

This command was introduced.

Examples

configure terminal ip wccp 50 interface ethernet0 ip wccp 50 redirect out

Related Commands

ip wccp redirect exclude in

ip wccp version

To change the WCCP version number, use the ip wccp version global configuration command.

ip wccp version {1 | 2}

Syntax Description

1

Enables WCCP Version 1

2

Enables WCCP Version 2

Defaults

Version 2 is the default.

Command Modes

Global configuration

Command History

Release Modification

12.0(5)T

This command was introduced.

Usage Guidelines

To use boomerang features, you must use WCCP Version 2. The default WCCP version is Version 2.

Examples

ip wccp version 2

show ip interface

To display status about any ip wccp direct commands configured on an interface, use the show ip interface EXEC command.

show ip interface [type-number]

Syntax Description

type-number

(Optional.) The interface number whose status is being displayed.

Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release Modification

10.0

This command was introduced.

12.0

This command was enhanced.

12.0(3)T

This command was enhanced to include status of the ip wccp redirect out and ip wccp redirect exclude add in commands.

Usage Guidelines

The Cisco IOS software automatically enters a directly connected route in the routing table if the interface is usable. A usable interface is one through which the software can send and receive packets. If the software determines that an interface is not usable, it removes the directly connected routing entry from the routing table. Removing the entry allows the software to use dynamic routing protocols to determine backup routes to the network (if any).

If the interface can provide two-way communication, the line protocol is indicated to be up. If the interface hardware is usable, the interface is indicated to be up.

If you specify an optional interface type, you will see information on that specific interface only.

If you specify no optional arguments, you will see information on all the interfaces.

When an asynchronous interface is encapsulated with Point-to-Point Protocol (PPP) or Serial Line Internet Protocol (SLIP), IP fast switching is enabled. A show ip interface command on an asynchronous interface encapsulated with PPP or SLIP displays a message indicating that IP fast switching is enabled.

Examples

The following example displays output from the show ip interface command, using the interface e3/0:

show ip interface e3/0 Ethernet3/0 is up Internet address is 17.1.1.38/24 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is disabled IP Optimum switching is enabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Network address translation is disabled WCCP Redirect outbound is enabled WCCP Redirect exclude is disabled

Table A-2 describes the fields shown in the example.


Table A-2: show ip interface Field Descriptions
Field Description

Ethernet 3/0 is up

If the interface hardware is usable, the interface is marked "up." For an interface to be usable, both the interface hardware and line protocol must be up.

Internet address

Shows the IP address of the interface.

Broadcast address

Shows the broadcast address.

Address determined by

Indicates how the IP address of the interface was determined.

MTU

Shows the Maximum Transmission Unit (MTU), or the maximum size of packets allowed to be transmitted from the router to a Content Router.

Helper address

Shows a helper address, if one has been set.

Directed broadcast forwarding

Shows a secondary address, if one has been set.

Outgoing access list

Indicates whether the interface has an outgoing access list set.

Inbound access list

Indicates whether the interface has an incoming access list set.

Proxy ARP

Specifies the IP Security Option (IPSO) security level set for this interface.

Security level

Specifies the default IPSO security level for this interface.

Split horizon

Specifies that routing updates sent to a particular neighbor router should not contain information about routes that were learned from that neighbor.

ICMP redirects

Indicates whether Internet Control Message Protocol (ICMP) redirects will be sent on this interface.

ICMP unreachables

Indicates whether unreachable messages will be sent on this interface.

ICMP mask replies

Indicates whether ICMP mask messages that tests node reachability across the network will be suppressed.

IP fast switching

Indicates whether fast switching has been enabled for this interface. It is generally enabled on serial interfaces, such as this one.

IP fast switching on the same interface

Indicates whether fast switching has been disabled for this interface. It is generally enabled on serial interfaces, such as this one.

IP Optimum switching

Indicates whether the IP optimum switching feature has been turned on.

IP multicast fast switching

Indicates whether the IP multicast fast switching feature has been turned on.

Router Discovery

Indicates whether the Cisco Discovery Protocol has been turned off.

IP output packet accounting

Indicates whether the output packet counter has been turned off.

IP access violation accounting

Indicates whether the feature that counts unauthorized access events on the router has been turned off.

TCP/IP header compression

Indicates whether compression is enabled or disabled.

Probe proxy name replies

Indicates whether HP Probe proxy name replies are generated.

Gateway Discovery

Indicates whether the gateway discovery option has been turned off.

Policy routing

Indicates whether the policy routing option has been turned off.

Network address translation

Indicates whether the status of the network address translation feature has been enabled or disabled.

WCCP Redirect outbound

Indicates whether packets received on an interface are redirected to a Content Router. This field can be enabled or disabled.

WCCP Redirect exclude

Indicates whether packets targeted for an interface will be excluded from being redirected to a Content Router. This field can be enabled or disabled.

Related Commands

show ip wccp

show ip wccp

To display global statistics related to the Web Cache Communication Protocol (WCCP) feature, use the show ip wccp EXEC command.

show ip wccp {web-cache | service-number} [view | detail]

Syntax Description

web-cache

Directs the router to display statistics for the Web cache service.

service-number

Identification number of the Content Router service group being controlled by a router. The number can be from 0 to 99. The DNS boomerang service is indicated by a value of 50.

view

(Optional.) Directs the router to display statistics for the WCCP view configuration.

detail

(Optional.) Directs the router to display statistics for the WCCP detail configuration.

Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release Modification

11.1 CA and 11.2 P

This command was introduced.

12.0(3)T

The user was allowed to query the router for the current global configuration information in use by either a single service or all services.

Usage Guidelines

Use the clear ip wccp command to reset the counter for the "Total Packets Redirected" information.

Examples

The following example displays output from the show ip wccp command:

show ip wccp Global WCCP Information: Service Name: 50 Number of Cache Engines:1 Number of Routers:2 Total Packets Redirected:198 Redirect access-list:-none- Total Packets Denied Redirect:0 Total Packets Unassigned:0 Group access-list:11 Total Messages Denied to Group:0 Total Authentication failures:0

Table A-3 describes the fields shown in the example.


Table A-3: show ip wccp Field Descriptions
Field Description

Service Name

Service that is detailed in the display output.

Number of Content Routers

Number of Content Routers using the router as their home router.

Number of Routers

Number of routers in the service group.

Total Packets Redirected

Total number of packets redirected by the router.

Redirect access-list

Name or number of the access list that determines which packets will be redirected.

Total Packets Denied Redirect

Total number of packets that were not redirected because they did not match the access list.

Total Packets Unassigned

Number of packets that were not redirected because they were not assigned to any Content Router. Packets may not be assigned during initial discovery of Content Routers or when a Content Router is dropped from a cluster.

Group access-list

Content Router that is allowed to connect to the router.

Total Messages Denied to Group

Number of messages disallowed by the router because they did not meet all the requirements of the service group.

Total Authentication failures

Number of password authentication failures.

The following example displays output from the show ip wccp 50 detail EXEC command. This command displays Content Router and WCCP router statistics for a particular service group:

show ip wccp 50 detail WCCP Router information: IP Address: 192.168.88.10 Protocol Version: 2.0 WCCP Cache-Router Information IP Address: 192.168.88.11 Protocol Version: 2.0 State: Usable Initial Hash Info: AAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA Assigned Hash Info: FFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFF Hash Allotment: 256 (100.00%) Packets Redirected: 21345 Connect Time: 00:13:46

Table A-4 describes the fields shown in the example.


Table A-4: show ip wccp detail Field Descriptions
Field Description

WCCP Router information

Header for the area that contains fields for the IP address and version of WCCP associated with the router connected to the Content Router in the service group.

IP Address

IP address of the router connected to the Content Router in the service group.

Protocol Version

Version of WCCP being used by the router in the service group.

WCCP Cache-Router information

Fields for information on Content Routers.

IP Address

IP address of the Content Router in the service group.

Protocol Version

Version of WCCP being used by the Content Router in the service group.

State

Indicates whether the Content Router is operating properly and can be contacted by a router and other Content Routers in the service group.

Initial Hash Info

Initial state of the hash bucket assignment.

Assigned Hash Info

Current state of the hash bucket assignment.

Hash Allotment

Percentage of buckets assigned to the current Content Router. Both a value and a percentage figure are displayed.

Packets Redirected

Number of packets that have been redirected to the Content Router.

Connect Time

Length of time the Content Router has been connected.

The following is sample output from the show ip wccp view EXEC command. In this case, the service number 50 has been specified.

show ip wccp service 50 view WCCP Router Informed of: 192.168.88.10 192.168.88.20 WCCP Content Routers Visible 192.168.88.11 192.168.88.12 WCCP Content Routers Not Visible: -none-

If any Content Router is displayed under the WCCP Content Routers Not Visible field, the Content Router needs to be reconfigured to add this router to it. Table A-5 describes the fields shown in the example.


Table A-5: show ip wccp view Field Descriptions
Field Description

WCCP Routers Informed of

List of routers detected by the current router.

WCCP Content Routers Visible

List of Content Routers that are visible to the router and other Content Routers in the service group.

WCCP Content Routers Not Visible

List of Content Routers in the service group that are not visible to the router and other Content Routers in the service group.

Related Commands

ip wccp detail


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Posted: Fri Dec 29 10:11:44 PST 2000
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