From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Sep 13 2004 - 17:50:44 GMT-3
The reason it doesn't dampen the other routes is because there
are no dampening parameters applied to them. If you just say "bgp
dampening" without any options it will apply to all routes, but if you
call a route map you have to "set dampening" parameters otherwise
dampening will not occur.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> gladston@br.ibm.com
> Sent: Monday, September 13, 2004 12:46 PM
> To: ccielab@groupstudy.com
> Subject: Dampening with Route-map - Halabi's example 12-90
>
> I though there was an error on example 12-90, that route-map
> SELECTIVE_DAMPENING permit 20 would select any route (because there is
no
> match command). But when implementing it, the route 193.78.1.0 does
not go
> to history state.
>
> It seems that the behavior of route-map is different when dampening
> (comparing with filtering updates, where a "route-map X permit 20"
without
> a match clause would allow any other updates)
>
> Any advice?
>
>
>
> atm#sh run
> router bgp 7
> no synchronization
> bgp dampening route-map Dampening23
> neighbor 172.16.101.1 remote-as 1
> neighbor 172.16.102.2 remote-as 2
> neighbor 172.16.106.6 remote-as 8
> no auto-summary
> !
> access-list 23 permit 150.150.1.0 0.0.0.255
> route-map Dampening23 permit 10
> match ip address 23
> set dampening 45 1000 2000 50
> !
> route-map Dampening23 permit 20
>
>
> atm#sb
> Network Next Hop Metric LocPrf Weight Path
> *> 150.150.1.0/24 172.16.106.6 0 0 8 i
> *> 172.16.220.0/24 172.16.101.1 0 1 3 i
> *> 193.78.1.0 172.16.106.6 0 0 8 i
>
> r6#conf t
> r6(config-if)#int lo 21
> r6(config-if)#sh
> r6(config-if)#int lo 10
> r6(config-if)#sh
>
> r6#sib
> Interface IP-Address OK? Method Status
> Loopback10 193.78.1.1 YES NVRAM administratively
> down down
> Loopback21 150.150.1.1 YES manual administratively
> down down
>
> atm#sb
> Network Next Hop Metric LocPrf Weight Path
> h 150.150.1.0/24 172.16.106.6 0 0 8 i
> *> 172.16.220.0/24 172.16.101.1 0 1 3 i
>
>
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