Wednesday, October 5, 2011

LAB: BGP - Aggregation summary suppress map

- Modify the solution for the previous task so that R2 advertises 10.0.2.0/24 prefix in addition to the summary route.

It is possible to suppress prefixes selectively, using a route-map associated via the parameter suppress-map. The prefixes permitted by this route-map are suppressed; prefixes denied by this route-map are NOT suppressed when performing summarization.

configuration:

ip prefix-list NET_2 permit 10.0.2.0/24
!
route-map SUPPRESS_MAP deny 10
match ip address prefix-list NET_2
!
route-map SUPPRESS_MAP permit 100
!
router bgp 200
aggregate-address 10.0.0.0 255.255.252.0 summary-only suppress-map SUPPRESS_MAP

verification:

Rack1R2#show ip bgp | include 10.0
s> 10.0.0.0/24         0.0.0.0     0 32768 i
*> 10.0.0.0/22         0.0.0.0       32768 i
s> 10.0.1.0/24         0.0.0.0     0 32768 i
*> 10.0.2.0/24         0.0.0.0     0 32768 i
s> 10.0.3.0/24         0.0.0.0     0 32768 i

Rack1R2#show ip bgp neighbors 155.1.0.5 advertised-routes
BGP table version is 36, local router ID is 150.1.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network         Next Hop     Metric LocPrf Weight Path
*> 10.0.0.0/22         0.0.0.0     32768 i
*> 10.0.2.0/24         0.0.0.0     0 32768 i
*> 205.90.31.0         192.10.1.254     0 0 254 ?
*> 220.20.3.0         192.10.1.254     0 0 254 ?
*> 222.22.2.0         192.10.1.254     0 0 254 ?

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