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This section describes the function and displays the syntax of IP commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Router Products Command Reference publication.
[no] access-class access-list-number {in | out}
Use the access-class line configuration command to restrict incoming and outgoing connections between a particular virtual terminal line (into a Cisco device) and the addresses in an access list. The no form of this command removes access restrictions on the line for the specified connections.
| access-list-number | Integer from 1 through 99 that identifies a specific access list of Internet addresses. |
| in | Restricts incoming connections between a particular Cisco device and the addresses in the access list. |
| out | Restricts outgoing connections between a particular Cisco device and the addresses in the access list. |
access-list access-list-number {permit | deny} source [source-mask]
no access-list access-list-number
Use the access-list global configuration command to create or remove a standard access list and control access to it. Use the no form of this command to delete the entire access list.
| access-list-number | Integer from 1 through 99 that you assign to identify one or more permit/deny conditions as an access list. Access list 0 (zero) is predefined; it permits any address and is the default access list for all interfaces. |
| permit | Permits access for matching conditions. |
| deny | Denies access to matching conditions. |
| source | Compares the source address being tested to this value. It is a 32-bit quantity written in dotted-decimal format. |
| source-mask | (Optional) 32-bit quantity written in dotted-decimal format. Address bits corresponding to wildcard mask bits set to 1 are ignored in comparisons; address bits corresponding to wildcard mask bits set to zero are used in comparisons. |
access-list access-list-number {permit | deny} protocol source
source-mask destination destination-mask [operator operand]
[established]
no access-list access-list-number
Use the extended access-list global configuration command to create or remove an extended access list. Use the no form of this command to delete the entire extended access list. An extended access list defaults to an implicit deny statement for everything that has not been permitted.
| access-list-number | Integer from 100 through 199 that you assign to identify one or more extended permit/deny conditions as an extended access list. |
| permit | Permits access to matching conditions. |
| deny | Denies access to matching conditions. |
| protocol | One of the following protocols: ip, tcp, udp, icmp, igmp, gre, or igrp or an integer in the range of 0 through 255 representing an IP protocol number. Use the keyword ip to match any Internet protocol, including TCP, UDP, and ICMP. |
| source | Internet source address in dotted-decimal format. |
| source-mask | Mask of source address bits in dotted-decimal format. The source and source-mask arguments are used to match the source address of a packet. |
| destination | Internet destination address in dotted-decimal format. |
| destination-mask | Mask of destination address bits in dotted-decimal format. The destination and destination mask arguments are used to match the destination address of a packet. |
| operator | (Optional) Compares destination ports. Note that the ip and icmp protocol keywords do not allow port distinctions. Possible operands include lt (less than), gt (greater than), eq (equal), and neq (not equal). |
| operand | (Optional) Decimal destination port to compare. Note that the ip and icmp protocol keywords do not allow port distinctions. |
| established | (Optional) For the TCP protocol only: to indicate an established connection. A match occurs if the TCP datagram has the ACK or RST bits set. The nonmatching case is that of the initial TCP datagram to form a connection. |
[no] arp ip-address hardware-address type [alias]
Use the arp global configuration command to install a permanent entry in the ARP cache. The router uses this entry to translate 32-bit Internet Protocol addresses into 48-bit hardware addresses. Use the no form of this command to remove the specified entry from the ARP cache. By default, no entries are permanently installed in the ARP cache.
| ip-address | Internet address in dotted-decimal format corresponding to the local data link address. |
| hardware-address | Local data link address (a 48-bit address). |
| type | Encapsulation description. This is typically the arpa keyword for Ethernet and is always snap for FDDI and Token Ring interfaces. |
| alias | (Optional) Indicates that the router should respond to ARP requests as if it were the owner of the specified address. |
[no] arp {arpa | probe | snap}
Use the arp interface configuration command to control the interface-specific handling of IP address resolution into 48-bit Ethernet, FDDI, and Token Ring hardware addresses. Use the no form of this command to selectively disable the specified interface encapsulation type.
| arpa | Standard Ethernet-style ARP (RFC 826); the default |
| probe | HP Probe protocol for IEEE-802.3 networks |
| snap | ARP packets conforming to RFC 1042 |
Use the arp timeout interface configuration command to control the number of seconds an ARP cache entry will stay in the cache. Use the no form of this command to restore the default value.
| seconds | Value used to age an ARP cache entry related to that interface. A value of 0 (zero) seconds sets no timeout; then the cache entries are never cleared. The default is 14400 seconds (4 hours). |
Use the clear arp-cache privileged EXEC command to remove all dynamic entries from the ARP cache, to clear the fast-switching cache, and to clear the IP route cache.
Use the clear host privileged EXEC command to remove one or all entries from the host name-and-address cache.
| name | Particular host entry to remove. |
| * | Removes all entries. |
clear ip accounting [checkpoint]
Use the clear ip accounting privileged EXEC command to clear the active database when IP accounting is enabled. Use the clear ip accounting checkpoint command to clear the checkpointed database when IP accounting is enabled.
| checkpoint | (Optional) Clears the checkpointed database. |
clear ip route {network [mask] | *}
Use the clear ip route privileged EXEC command to remove one or more routes from the IP routing table. By default, all entries are removed.
| network | Network or subnet address to remove. |
| mask | (Optional) Subnet address to remove. |
| * | Removes all routing table entries. |
Use the clear ip sse privileged EXEC command to cause the route processor to recompute the program for IP on the Cisco 7000 series.
Use the dnsix-dmdp retries global configuration command to set the retransmit count used by the DNSIX Message Delivery Protocol (DMDP). Use the no form of this command to revert to the default number of retries.
| count | Number of times DMDP will retransmit a message. An integer from 0 through 200. The default is 4 retries. |
[no] dnsix-nat authorized-redirection ip-address
Use the dnsix-nat authorized-redirection global configuration command to specify the address of a collection center that is authorized to change the primary and secondary addresses of the host to receive audit messages. Use the no form of this command to delete the entry.
| ip-address | IP address of the host from which redirection requests are permitted |
[no] dnsix-nat primary ip-address
Use the dnsix-nat primary global configuration command to specify the IP address of the host to which DNSIX audit messages are sent. Use the no form of this command to delete the entry. By default, messages are not sent.
| ip-address | IP address for the primary collection center |
[no] dnsix-nat secondary ip-address
Use the dnsix-nat secondary global configuration command to specify an alternate IP address for the host to which DNSIX audit messages are sent. Use the no dnsix-nat secondary command to delete the entry. By default, no alternate IP address is known.
| ip-address | IP address for the secondary collection center |
[no] dnsix-nat source ip-address
Use the dnsix-nat source global configuration command to start the audit-writing module and to define audit trail source address. Use the no form of this command to disable the DNSIX audit trail writing module. By default, the module is disabled.
| ip-address | Source IP address for DNSIX audit messages |
[no] dnsix-nat transmit-count count
Use the dnsix-nat transmit-count global configuration command to cause the audit writing module to collect multiple audit messages in the buffer before sending the messages to a collection center. Use the no form of this command to revert to the default audit message count.
| count | Number of audit messages to buffer before transmitting to the server. Integer from 1 through 200. The default is 1. |
[no] ip access-group access-list-number {in | out}
Use the ip access-group interface configuration command to control access to an interface. Use the no form of this command to remove the specified access group. If a keyword is not specified, out is the default.
| access-list-number | Access list number from 1 through 199. |
| in | Filters on inbound packets. |
| out | Filters on outbound packets. |
Use the ip accounting interface configuration command to enable IP accounting on an interface. Use the no ip accounting command to disable IP accounting. By default, IP accounting is disabled.
[no] ip accounting-list ip-address mask
Use the ip accounting-list global configuration command to specify a set of filters to control the hosts for which IP accounting information is kept. Use the no form of this command with the appropriate argument to remove this function. By default, no filters are defined.
| ip-address | IP address in dotted-decimal format |
| mask | IP mask |
[no] ip accounting-threshold threshold
Use the ip accounting-threshold global configuration command to set the maximum number of accounting entries to be created. Use the no form of this command to restore the default.
| threshold | Maximum number of entries (source and destination address pairs) that the router accumulates, preventing IP accounting from possibly consuming all available free memory. The default is 512 entries. |
ip accounting-transits count
no ip accounting-transits
Use the ip accounting-transits global configuration command to control the number of transit records that will be stored in the IP accounting database. Use the no form of this command to remove this function, resetting the value to the default.
| count | Number of transit records that will be stored in the IP accounting database. The default is 0. |
[no] ip address ip-address mask
Use the ip address interface configuration command to set an IP address for an interface. Use the no form of this command to remove the specified address.
| ip-address | IP address |
| mask | Mask for the associated IP subnet |
[no] ip address ip-address mask secondary
Use the ip address secondary interface configuration command to set multiple IP addresses for an interface. Use the no form of this command to remove the specified addresses.
| ip-address | IP address |
| mask | Mask for the associated IP subnet |
[no] ip broadcast-address [ip-address]
Use the ip broadcast-address interface configuration command to define a broadcast address for an interface. Use the no form of this command to restore the IP broadcast address to the default.
| ip-address | (Optional) IP broadcast address for a network. The default address is 255.255.255.255 (all ones) |
ip cache-invalidate-delay [minimum maximum quiet threshold]
no ip cache-invalidate-delay
Use the ip cache-invalidate-delay global configuration command to control the invalidation rate of the IP route cache. Use the no form of this command to allow the IP route cache to be immediately invalidated.
| minimum | (Optional) Minimum time, in seconds, between invalidation request and actual invalidation. The default is 2 seconds. |
| maximum | (Optional) Maximum time, in seconds, between invalidation request and actual invalidation. The default is 5 seconds. |
| quiet | (Optional) Length of quiet period, in seconds, before invalidation. |
| threshold | (Optional) Maximum number of invalidation requests considered to be quiet. |
[no] ip default-gateway ip-address
Use the ip default-gateway global configuration command to define a default gateway (router) when IP routing is disabled. Use the no form of this command to disable this function.
| ip-address | IP address of the router |
[no] ip directed-broadcast [access-list-number]
Use the ip directed-broadcast interface configuration command to enable directed broadcast-to-physical broadcast translation on an interface. Use the no form of this command to disable directed broadcast-to-physical broadcast translation on an interface.
| access-list-number | (Optional) Number of the access list. If specified, a broadcast must pass the access list to be forwarded. If not specified, all broadcasts will be forwarded. |
Use the ip domain-list global configuration command to define a list of default domain names to complete unqualified host names. Use the no form of this command with the appropriate argument to delete a name from the list.
| name | Domain name. Do not include the initial period that separates an unqualified name from the domain name. |
Use the ip domain-lookup global configuration command to enable the IP Domain Name System-based host name-to-address translation. Use the no form of this command to disable the Domain Name System.
Use the ip domain-lookup nsap global configuration command to allow Domain Name System (DNS) queries for CLNS addresses. Use the no form of this command to disable this feature.
ip domain-name name
no ip domain-name
Use the ip domain-name global configuration command to define a default domain name that the router uses to complete unqualified host names (names without a dotted-decimal domain name). Use the no form of this command to disable the use of the Domain Name System.
| name | Default domain name used to complete unqualified host names. Do not include the initial period that separates an unqualified name from the domain name. |
[no] ip forward-protocol {udp [port] | nd | snds}
Use the ip forward-protocol global configuration command to specify which protocols and ports the router will forward. Use the no form of this command (with the appropriate keyword and argument) to remove the protocol/port. See this command in the Router Products Command Reference publication for a list of datagrams forwarded by default.
| udp | Forward User Datagram Protocol (UDP) datagrams. |
| port | (Optional) Destination port that controls which UDP services are forwarded. |
| nd | Forward Network Disk (ND) datagrams. This protocol is used by older diskless SUN workstations. |
| snds | Network Security Protocol. |
[no] ip forward-protocol spanning-tree
Use the ip forward-protocol spanning-tree global configuration command to permit IP broadcasts to be flooded throughout the internetwork in a controlled fashion. Use the no form of this command to disable flooding of IP broadcasts.
[no] ip forward-protocol turbo-flood
Use the ip forward-protocol turbo-flood global configuration command to speed up flooding of User Datagram Protocol (UDP) datagrams using the spanning-tree algorithm. Use the no form of this command to disable this feature.
Use the ip gdp gdp interface configuration command to configure the router discovery feature using the Cisco Gateway Discovery Protocol (GDP) routing protocol. Use the no form of this command to disable this feature.
Use the ip gdp igrp interface configuration command to configure the router discovery feature using the Cisco Interior Gateway Routing Protocol (IGRP) routing protocol. Use the no form of this command to disable this feature.
Use the ip gdp irdp interface configuration command to configure the router discovery feature using the ICMP Router Discovery Protocol (IRDP). Use the no form of this command to disable this feature.
Use the ip gdp rip interface configuration command to configure the router discovery feature using the RIP routing protocol. Use the no form of this command to disable this feature.
[no] ip helper-address address
Use the ip helper-address interface configuration command to tell the router to forward User Datagram Protocol (UDP) broadcasts, including BootP, received on an interface. Use the no form of this command to disable the forwarding of broadcast packets to specific addresses.
| address | Destination broadcast or host address to be used when forwarding UDP broadcasts. You can have more than one helper address per interface. |
ip host name [tcp-port-number] address1 [address2...address8]
no ip host name address
Use the ip host global configuration command to define a static host name-to-address mapping in the host cache. Use the no form of this command to remove the name-to-address mapping.
| name | Name of the host. The first character can be either a letter or a number, but if you use a number, the operations you can perform are limited. |
| tcp-port-number | (Optional) TCP port number--Telnet by default (port 23). |
| address | Associated IP address. Up to eight addresses can be bound to a host name. |
[no] ip hp-host hostname ip-address
Use the ip hp-host global configuration command to enter the host name of an HP host to be used for HP Probe Proxy service into the host table. Use the no form of this command with the appropriate arguments to remove the host name.
| hostname | Name of the host |
| ip-address | IP address of the host |
Use the ip mask-reply interface configuration command to tell the router to respond to Internet Control Message Protocol (ICMP) mask requests by sending ICMP Mask Reply messages. Use the no form of this command to disable this function.
Use the ip mtu interface configuration command to set the maximum transmission unit (MTU) size of IP packets sent on an interface. Use the no form of this command to restore the default.
| bytes | IP MTU in bytes. Minimum is 128 bytes; maximum depends on interface medium type. |
[no] ip name-server server-address1 [[server-address2]...
server-address6]
Use the ip name-server global configuration command to specify the address of one or more name servers to use for name and address resolution. Use the no form of this command to remove the addresses specified and restore the default.
| server-address1...6 | IP addresses of up to six name servers |
Use the ip probe proxy interface configuration command to enable the HP Probe Proxy support that allows a router to respond to HP Probe Proxy Name requests. Use the no form of this command to disable HP Probe Proxy.
Use the ip proxy-arp interface configuration command to enable proxy ARP on an interface. Use the no form of this command to disable proxy ARP on the interface.
Use the ip redirects interface configuration command to enable the sending of redirect messages if the router is forced to resend a packet through the same interface on which it was received. Use the no form of this command to disable the sending of redirect messages.
[no] ip route-cache [cbus]
[no] ip route-cache same-interface
[no] ip route-cache sse
Use the ip route-cache interface configuration command to control the use of a high-speed switching cache for IP routing as well as the use of autonomous switching. Use the no form of this command to disable fast switching and autonomous switching.
| cbus | (Optional) Enables both autonomous switching and fast switching. By default, IP autonomous switching is disabled; fast switching varies by interface and media. |
| same-interface | Enables fast switching packets back out the interface on which they arrived. Fast switching varies by interface and media. |
| sse | Enables SSE fast switching on the SSP board on the Cisco 7000 series. By default, SSE switching of IP is disabled. |
Use the ip routing global configuration command to enable IP routing. Use the no form of this command to disable IP routing for the router.
Use the ip security add interface configuration command to add a basic security option to all outgoing packets. Use the no form of this command to disable the adding of a basic security option to all outgoing packets.
[no] ip security aeso source compartment-bits
Use the ip security aeso command to attach Auxiliary Extended Security Option (AESOs) to an interface. Use the no form of this command to disable AESO on an interface.
| source | Extended Security Option (ESO) source. An integer from 0 through 255. |
| compartment-bits | Compartment bits in hex. |
[no] ip security dedicated level authority [authority...]
Use the ip security dedicated interface configuration command to set the requested level of classification and authority on the interface. Use the no form of this command to reset the interface to the default classification and authorities.
| level | Degree of sensitivity of information. The level keywords are listed in the IPSO level keywords and bit patterns table in the Router Products Command Reference publication. |
| authority | Organization that defines the set of security levels that will be used in a network. The authority keywords are listed in the IPSO authority keywords and bit patterns table in the Router Products Command Reference publication. |
[no] ip security eso-info source compartment-size default-bit
Use the ip security eso-info global configuration command to configure system-wide defaults for extended IP Security Option (IPSO) information. Use the no form of this command to revert to default settings.
| source | Hex or decimal value representing the extended IPSO source. An integer from 0 through 255. |
| compartment-size | Maximum number of bytes of compartment information allowed for a particular extended IPSO source. An integer from 1 through 16. |
| default-bit | Default bit value for any unsent compartment bits. |
[no] ip security eso-max source compartment-bits
Use the ip security eso-max interface configuration command to specify the maximum sensitivity level for an interface. Use the no form of this command to revert to the default.
| source | Extended Security Option (ESO) source. An integer from 1 through 255. |
| compartment-bits | Compartment bits in hex. |
[no] ip security eso-min source compartment-bits
Use the ip security eso-min interface configuration command to configure the minimum sensitivity for an interface. Use the no form of this command to revert to the default.
| source | Extended Security Option (ESO) source. An integer from 1 through 255. |
| compartment-bits | Compartment bits in hex. |
[no] ip security extended-allowed
Use the ip security extended-allowed interface configuration command to accept packets on an interface that has an extended security option present. Packets containing extended security options are rejected. Use the no form of this command to restore the default.
Use the ip security first interface configuration command to prioritize the presence of security options on a packet. Use the no form of the command to disable this function.
[no] ip security ignore-authorities
Use the ip security ignore-authorities interface configuration command to cause the router to ignore the authorities field of all incoming packets. Use the no form of this command to disable this function.
[no] ip security implicit-labelling [level authority [authority...]]
Use the ip security implicit-labelling interface configuration command to force the router to accept packets on the interface, even if they do not include a security option. Use the no form of this command to disable this function.
| level | (Optional) Degree of sensitivity of information. If your interface has multilevel security set, you must specify this argument. The level keywords are listed in the IPSO level keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
| authority | (Optional) Organization that defines the set of security levels that will be used in a network. If your interface has multilevel security set, you must specify this argument. You can specify more than one. The authority keywords are listed in the IPSO authority keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
ip security multilevel level1 [authority1...] to level2 authority2
[authority2...]
no ip security multilevel
Use the ip security multilevel interface configuration command to set the interface to the requested range of classifications and authorities. All traffic entering or leaving the system must have a security option that falls within this range.
| level1 | Degree of sensitivity of information. The classification level of incoming packets must be equal to or greater than this value for processing to occur. The level keywords are found in the IPSO level keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
| authority1 | (Optional) Organization that defines the set of security levels that will be used in a network. The authority bits must be a superset of this value. The authority keywords are listed in the IPSO authority keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
| to | Separates the range of classifications and authorities. |
| level2 | Degree of sensitivity of information. The classification level of incoming packets must be equal to or less than this value for processing to occur. The level keywords are found in the IPSO level keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
| authority2 | Organization that defines the set of security levels that will be used in a network. The authority bits must be a proper subset of this value. The authority keywords are listed in the IPSO authority keywords and bit patterns table in the Router Products Command Reference publication (see the ip security dedicated command). |
[no] ip security reserved-allowed
Use the ip security reserved-allowed interface configuration command to treat as valid any packets that have Reserved1 through Reserved4 security levels. Use the no form of this command to disable this feature.
Use the ip security strip interface configuration command to remove any basic security option on outgoing packets on an interface. Use the no form of this command to disable this function.
Use the ip source-route global configuration command to allow the router to handle IP datagrams with source routing header options. Use the no form of this command to cause the system to discard any IP datagram containing a source-route option.
Use the ip subnet-zero global configuration command to enable use of subnet zero for interface addresses and routing updates. Hence, it provides the ability to configure and route to subnet-zero subnets. Use the no form of this command to restore the default.
[no] ip tcp compression-connections number
Use the ip tcp compression-connections interface configuration command to specify the total number of header compression connections that can exist on an interface. Use the no form of this command to restore the default.
| number | Number of connections the cache will support; number can vary between 3 and 256, inclusive. The default is 16. |
[no] ip tcp header-compression [passive]
Use the ip tcp header-compression interface configuration command to enable TCP header compression. Use the no form of this command to disable compression.
| passive | (Optional) Outgoing TCP packets are compressed only if incoming TCP packets on the same interface are compressed. If you do not specify the passive keyword, the router compresses all traffic. |
[no] ip tcp synwait-time seconds
Use the ip tcp synwait-time global configuration command to set a specified period of time the router will wait to attempt to establish a TCP connection before it times out. The no form of this command restores the default.
| seconds | Number of seconds the router waits to attempt to establish a TCP connection. Use any value between 5 and 300 seconds. The default is 30 seconds. |
[no] ip unnumbered interface-name
Use the ip unnumbered interface configuration command to enable IP processing on a serial interface without assigning an explicit IP address to the interface. Use the no form of this command to disable the IP processing on the interface.
| interface-name | Name of another interface on which the router has an assigned IP address. This interface-name cannot be another unnumbered interface. |
Use the ip unreachables interface configuration command to enable the generation of ICMP Unreachable messages on a specified interface. Use the no form of this command to disable this function.
ping [protocol] {host | address}
Use the ping (IP packet internet groper function) privileged EXEC command to send ICMP Echo messages to check host reachability and network connectivity. If the router receives an ICMP Echo message, it sends an ICMP Echo Reply message to the source of the ICMP Echo message.
| protocol | (Optional) Protocol keyword. IP is the default. |
| host | Host name of system to ping. |
| address | IP address of system to ping. |
ping [protocol] {host | ip-address}
Use the ping (IP packet internet groper function) user EXEC command to send ICMP Echo messages to check host reachability and network connectivity. If the router receives an ICMP Echo message, it sends an ICMP Echo Reply message to the source of the ICMP Echo message.
| protocol | (Optional) Protocol keyword. IP is the default. |
| host | Host name of system to ping. |
| ip-address | IP address of system to ping. |
Use the show access-lists privileged EXEC command to display the contents of all current access lists.
Use the show arp privileged EXEC command to display the entries in the ARP table for the router.
Use the show dnsix privileged EXEC command to display state information and the current configuration of the DNSIX audit writing module.
Use the show hosts EXEC command to display the default domain name, the style of name lookup service, a list of name server hosts, and the cached list of host names and addresses.
show ip accounting [checkpoint]
Use the show ip accounting privileged EXEC command to display the active accounting or checkpointed database.
| checkpoint | (Optional) Indicates that the checkpointed database should be displayed. |
Use the show ip aliases EXEC command to display the router's Internet addresses mapped to TCP ports (aliases) and SLIP addresses, which are treated similarly to aliases.
Use the show ip arp EXEC command to display the Address Resolution Protocol (ARP) cache, where SLIP addresses appear as permanent ARP table entries.
Use the show ip cache EXEC command to display the routing table cache used to fast switch Internet traffic.
show ip interface [interface unit]
Use the show ip interface EXEC command to display the usability status of interfaces.
| interface unit | (Optional) Interface type and number. |
Use the show ip masks EXEC command to display the masks used for network addresses and the number of subnets using each mask.
| address | Network address for which a mask is required |
Use the show ip redirects EXEC command to display the address of a default gateway (router).
show ip route [address [mask]] | [protocol]
Use the show ip route EXEC command to display the current state of the routing table.
| address | (Optional) Address about which routing information should be displayed. |
| mask | (Optional) Argument for a subnet mask. |
| protocol | (Optional) Argument for a particular routing protocol, or static or connected. |
Use the show ip route summary EXEC command to display the current state of the routing table.
show ip tcp header-compression
Use the show ip tcp header-compression EXEC command to display statistics on TCP header compression.
Use the show ip traffic EXEC command to display IP protocol statistics.
To display a summary of Silicon Switch Processor (SSP) statistics, use the show sse summary EXEC command.
Use the show standby EXEC command to display standby protocol information.
[no] standby authentication string
Use the standby authentication interface configuration command to configure an authentication string. Use the no form of this command to delete the authentication string.
| string | Authentication string, up to eight characters long. The default string is "cisco." |
Use the standby group interface configuration command to specify the number of the group in which the router will participate. Use the no form of this command to use the default group.
| number | The group number. An integer between 0 and 255. The default is group number 0. |
Use the standby ip interface configuration command to activate the hot standby protocol on the configured interface. Use the no form of this command to disable the standby function on an interface.
| ip-address | (Optional) Interface hot standby IP address |
Use the standby preempt interface configuration command to indicate that, if the local router is configured with a priority higher than the current designated router, the local router should attempt to assume control as the designated router. Use the no form of this command to cause the local router to assume control as the designated router only if it receives information indicating that there is no router currently in the active state (acting as the designated router).
Use the standby priority interface configuration command to prioritize a potential hot standby router. Use the no form of this command to restore the priority to the default.
| number | Priority value. An integer from 0 through 255. The default is 100. |
[no] standby timers hellotime holdtime
Use the standby timers interface configuration command to configure the time between hellos and the time before other routers declare the active or standby router to be down. Use the no form of this command to restore the timers to their default values.
| hellotime | Hello interval in seconds. An integer between 1 and 255. The default is 1 second. |
| holdtime | Time in seconds before the active or standby router is declared to be down. An integer between 1 and 255. The default is 3 seconds. |
Use the trace privileged EXEC command to discover the routes the router's packets will actually take when traveling to their destination.
| destination | (Optional) Destination address or host name on the command line. The default parameters for the appropriate protocol are assumed and the tracing action begins. |
Use the trace ip user EXEC command to discover the IP routes the router's packets will actually take when traveling to their destination.
| destination | Destination address or host name on the command line. The default parameters for the appropriate protocol are assumed and the tracing action begins. |
transmit-interface interface-name
no transmit-interface
Use the transmit-interface interface configuration command to assign a transmit interface to a receive-only interface. This is used commonly with microwave Ethernet links. The no form of this command reverts both interfaces to normal duplex Ethernet interfaces.
| interface-name | Transmit interface to be linked with the (current) receive-only interface |
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