Configuring Route Map for Neighbors

Route maps are used to control and modify routing information that is exchanged between routing domains. Route maps consist of a list of match and set configuration commands. The match commands specify match criteria and the set commands specify the action taken if the match criteria are met.

When applied to incoming or outgoing routes, route map provides the control on the distribution of routes between two BGP peers.

When configuring “In direction Routemap for the Neighbor”, the route map will be applied on the routes coming from that Neighbor before installing to the local RIB.

When configuring “Out direction Routemap for the Neighbor”, the route map will be applied on the routes advertised to that neighbor.

The figure shown below depicts the topology setup used for this configuration.

Figure 1. BGP Configuration and Testing Topology

Use the following commands to configure BGP routing.

To enable BGP in Router R1:

Execute the following commands:

Enter the Global Configuration Mode.

iS5comm# configure terminal

Enter the Autonomous System ( AS) number in R1.

iS5comm(config)# as-num 100

Configure the router-id in R1.

iS5comm(config)# router-id 12.0.0.1

Enable BGP in R1.

iS5comm(config)# router bgp 100

Configure R2 (with as-num 100) as internal peer in R1.

iS5comm(config-router)# neighbor 12.0.0.2 remote-as 100

Configure Out Direction Route Map for the peer R2.

iS5comm(config-router)# neighbor 10.0.0.2 route-map RMAP out

Configure In Direction Route Map for the peer R2.

iS5comm(config-router)# neighbor 12.0.0.2 route-map INRMAP in

Create Route map RMAP.

iS5comm(config)# route-map  RMAP permit 10

Match destination ip 16.0.0.0 /8

iS5comm(config-rmap-RMAP)# match destination ip 16.0.0.0 255.0.0.0

Set local preference.

iS5comm(config-rmap-RMAP)# set local-preference 150

Create Route map INRMAP. local preference.

iS5comm(config)# route-map INRMAP permit 10

Match destination IP 17.0.0.0 /8

iS5comm(config-rmap-RMAP)# match destination ip 17.0.0.0 255.0.0.0

Set local preference

iS5comm(config-rmap-RMAP)# set local-preference 125

To enable BGP in Router R2:
Execute the following commands:
- Enter the Global Configuration Mode.
```
iS5comm# configure terminal
```
- Enter the Autonomous System ( AS) number in R2.
```
iS5comm(config)# as-num 100
```
- Configure the router-id in R2.
```
iS5comm(config)# router-id 12.0.0.2
```
- Enable BGP in R2.
```
iS5comm(config)# router bgp 100
```
- Configure R1 (with as-num 100) as internal peer in R2.
```
iS5comm(config-router)# neighbor 12.0.0.1 remote-as 100
```
R1: Add static route 16.0.0.0/8.

R2: Add static route 17.0.0.0/8 and verify the results.

Type the following:

iS5comm# show ip bgp neighbor

BGP neighbor is 12.0.0.2, remote AS 100, external link

BGP version 4, remote router ID 12.0.0.2

BGP state = Established, up for 2 minutes 43 seconds, un-authenticated session

Configured BGP Maximum Prefix Limit 100

Configured Connect Retry Count 5

Current Connect Retry Count 0

Peer Passive : DISABLED

Peer Status : NOT DAMPED

Rcvd update before 0 secs, hold time is 90, keepalive interval is 30 secs

Neighbors Capability:

Route-Refresh: Advertised and received

Address family IPv4 Unicast: Advertised and received

Received 7 messages, 0 Updates

Sent 7 messages, 0 Updates

Route refresh: Received 0, sent 0.

Minimum time between advertisement runs is 5 seconds

Connections established 1 time(s)

Local host: 12.0.0.1, Local port: 179

Foreign host: 12.0.0.2, Foreign port: 49152

Last Error: Code 0, SubCode 0.

R2: View the BGP session information using ‘show ip bgp summary’, ‘show ip bgp neighbor’ and ‘show ip bgp info’ commands.

Type the following:

iS5comm# show ip bgp summary

BGP router identifier is 10.0.0.2, local AS number 100

BGP table version is 0

Neighbor  Version AS MsgRcvd MsgSent Up/DownState/PfxRcd

 -------------------------------- ----------------

10.0.0.1  4      100  6      6       00:00:00:0  Established

iS5comm# show ip bgp summary

BGP neighbor is 10.0.0.1, remote AS 100, internal link

BGP version 4, remote router ID 10.0.0.1

BGP state = Established, up for 2 minutes 27 seconds

Configured BGP Maximum Prefix Limit 100

Configured Connect Retry Count 5

Current Connect Retry Count 0

Peer Passive : DISABLED

Peer Status : NOT DAMPED

Rcvd update before 0 secs, hold time is 90, keepalive interval is 30 secs

Neighbors Capability:

Route-Refresh: Advertised and received

Address family IPv4 Unicast: Advertised and received

Received 6 messages, 0 Updates

Sent 6 messages, 0 Updates

Route refresh: Received 0, sent 0.

Minimum time between advertisement runs is 5 seconds

Connections established 1 time(s)

Local host: 10.0.0.2, Local port: 179

Foreign host: 10.0.0.1, Foreign port: 49152

Last Error: Code 0, SubCode 0.

iS5comm# show ip bgp bgp

BGP table version is 3,local router ID is 12.0.0.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

 S Stale

 Origin codes: i - IGP, e - EGP, ? - incomplete

 Type       Network            NextHop     Metric  LocPrf  Path  Origin

----       -------            -------     ------  ------  ----  ------

 >           12.0.0.0/ 8         0.0.0.0       0       0     -     i

 >           16.0.0.0/ 8         0.0.0.0               0     -     ?

 >i          17.0.0.0/ 8        12.0.0.2             125     -     ?

iS5comm# show ip bgp bgp

BGP table version is 3,local router ID is 12.0.0.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

 S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Type   Network NextHop   Metric LocPrf Path  Origin

-----  ------ ------  ------  ----  ------

>    12.0.0.0/ 8  0.0.0.0   0      0     -      i

>i   16.0.0.0/ 8  12.0.0.1  150          -     ?

>    17.0.0.0/ 8  0.0.0.0    0           -     ?