Configuring Backhaul Interfaces and Routing Protocols
Configuring the Backhaul Interface
This section describes how to configure the Cisco AccessPath-TS3 Model 531 Integrated Access System for the following backhaul interfaces. See below for the minimum configuration statements for each interface:
Backhaul Interface
Minimum Configuration
Fast Ethernet
interface FastEthernet 2/0 ip address 192.168.2.1 255.255.255.0 full-duplex no shutdown
High-Speed Serial Interface (HSSI)
interface Hssi 2/0 ip address 192.168.3.1 255.255.255.252 no shutdown
Synchronous serial (serial)
interface Serial 4/0 ip address 192.168.4.1 255.255.255.252 no shutdown
Frame Relay (serial)
interface Serial 4/1 encapsulation frame-relay ip address 192.168.5.254 255.255.255.0 no shutdown
Assign an IP address to the backhaul interface of your Router Shelf so that it can be recognized as a device on your network. The Fast Ethernet interface supports 100-Mbps speeds with the 100BaseT hubs and switches. (The commands to configure for HSSI and synchronous serial interfaces are very similar.)
The above examples configure the interfaces for standard Cisco High-Level Data Link Control (HDLC) encapsulation. Another common type of serial configuration is Frame Relay. For more information on Frame Relay interface configuration, see the Cisco IOS configuration guide and command reference publications. These publications are available on the Documentation CD-ROM that shipped with your AccessPath-TS3 system, on the World Wide Web from Cisco's home page, or you can order printed copies.
Configure the Interfaces
To configure the interfaces:
Table 6-1 Configuring for Fast Ethernet, HSSI, and Synchronous Serial Interfaces
Step
Command
Purpose
1
RS01> enable
Password: <password>
RS01#
Enter enable mode.
Enter the password.
You have entered enable mode when the prompt changes to RS01#.
2
RS01# config term
Enter configuration commands, one per line. End with CNTL/Z.
RS01(config)#
Enter global configuration mode. You have entered global configuration mode when the prompt changes to RS01(config)#.
3
RS01(config)# interface fastethernet 2/0
RS01(config-if)#
[or]
RS01(config)# interface Hssi 2/0
RS01(config-if)#
[or]
RS01(config)# interface Serial 4/0
RS01(config-if)#
Enter Fast Ethernet interface configuration mode for a specific slot/port.
[or]
Enter HSSI interface configuration mode for a specific slot/port.
[or]
Enter Synchronous Serial interface configuration mode for a specific slot/port.
4
RS01(config-if)# ip address 192.168.2.1 255.255.255.0
Assign an IP address and subnet mask to the interface.
51
RS01(config-if)# full-duplex
[or]
RS01(config-if)# half-duplex
Set Fast Ethernet to operate at full duplex. [or]
Set Fast Ethernet to operate at half duplex. This is the default value.
6
RS01(config-if)# end
RS01#
%SYS-5-CONFIG_I: Configured from console by console
Return to privileged EXEC mode.
This message is normal and does not indicate an error.
1Do this step for the Fast Ethernet interface only.
Verify the IP Address, Speed, and Duplex Operation
To verify the IP address on any backhaul interface:
Enter the show arp command. Output shown below is for the Fast Ethernet interface.
RS01# show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.2.1 _ 0800.207e.bead ARPA FastEthernet2/0
To verify the configured speed on the Fast Ethernet interface:
Enter the show interface fastethernet 2/0 command:
RS01# show interface fastethernet 2/0
FastEthernet2/0 is up, line protocol is up
Hardware is DEC21140, address is 00e0.1e3e.c125 (bia 00e0.1e3e.c125)
Encapsulation ARPA, loopback not set, keepalive set (10 sec), auto duplex, 100BaseTX/FX, auto speed ^^^^^^^^^^^
Tips
If you are having trouble:
Make sure the cable connections are secure.
Make sure you are using the correct IP address.
For the Fast Ethernet interface only:
Make sure the duplex mode on the interface matches the duplex mode of the Fast Ethernet switch or hub to which it connects.
Caveats for the Frame Relay Interface Configuration
The configuration statements for the Frame Relay interface, provided at the beginning of this chapter, have the following caveats:
1. The configuration does not address any of the routing protocol issues associated with Frame Relay.
2. The configuration relies on the Cisco IOS Release 11.2 lmi auto-sense feature to determine the appropriate Local Management Interface (LMI) to use.
3. The configuration relies on Inverse Address Resolution Protocol (Inverse ARP) to map IP addresses to data-link connection identifiers (DLCIs) in the Frame Relay network.
4. The configuration does not use Internet Engineering Task Force (IETF) encapsulation, so system components using the configuration can communicate only with Cisco devices.
Note For more information on Frame Relay interface configuration, see the Cisco IOS
configuration guide and command reference publications. These publications are available on the
Documentation CD-ROM that shipped with your AccessPath-TS3 system, on the World Wide Web
from Cisco's home page, or you can order printed copies.
Configuring the Routing Protocol
This section provides procedures for configuring the AccessPath-TS3 system to use the following routing protocols on the Router Shelf backhaul:
Broadcast-capable backhaul interface in network 192.168.2.0 has already been configured.
Backhaul network uses OSPF process 1111.
Internal OSPF process is already configured as process 4242.
Network 192.168.2.0 is in area 102.
Note Configure the appropriate network interfaces for the backhaul networks before following this
procedure.
Table 6-4 Configuring OSPF Routing
Step
Command
Purpose
1
RS01> enable
Password: <password>
RS01#
Enter enable mode.
Enter the password.
You have entered enable mode when the prompt changes to RS01#.
2
RS01# config term
Enter configuration commands, one per line. End with CNTL/Z.
RS01(config)#
Enter global configuration mode. You have entered global configuration mode when the prompt changes to RS01(config)#.
3
RS01(config)# router ospf 1111
Configure an OSPF routing process. The process number must not match the number used in the customer's OSPF domain.
4
RS01(config-router)# network 192.168.2.0 0.0.0.255 area 102
Configure the network statements for the backhaul IP network(s) for the backhaul OSPF process. The area number must match the area of the connected network.
5
RS01(config-router)# redistribute ospf 4242
RS01(config-router)# router ospf 4242
RS01(config-router)# redistribute ospf 1111
Configure mutual redistribution between the OSPF and EIGRP domains.
