Examples

Example I Using an ACL-match in a route map to update just a single route out of an update

1. Configure static routes on the AW+ switch.

BGP(config)#ip route 192.34.23.0/26 64.93.23.1

BGP(config)#ip route 192.34.23.32/29 64.193.54.1

BGP(config)#ip route 192.34.23.192/27 64.12.89.1

2.Configure BGP to redistribute static routes. router bgp 34567

redistribute connected redistribute static

neighbor 45.45.45.46 remote-as 34568

3.Create an ACL that matches just one of these routes.

access-list standard marker permit 192.34.23.32/29

4.Create a route map with one clause that matches on this ACL and prepends an AS-path (and then has another clause the permits everything else).

route-map marker permit 1 match ip address marker set as-path prepend 7822

route-map marker permit 2

5.Apply this route map as the out route map for the peer. router bgp 34567

redistribute connected redistribute static

neighbor 45.45.45.46 remote-as 34568 neighbor 45.45.45.46 route-map marker out

6.Shut down the neighbor, and then bring it up again:

awplus(config-router)#neighbor 45.45.45.46 shutdown awplus(config-router)#neighbor 45.45.45.46 no shutdown

7.Check the BGP table on the peer. Only one route should arrive at the other end with that extra entry in the as-path.

Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes Page 43

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Allied Telesis X8100, x908 manual route-map marker permit

X8100, x908 specifications

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