From: Harry Chan (harrychan.hk@gmail.com)
Date: Mon Aug 04 2008 - 03:09:24 ART
In your configuration, R5 is sending community attribute to R2, but R2
is not propagating that therefore R1 is sending this route to R4.
You need to add the neighbor x.x.x.x send-community to R1 R2 & R3.
2008/8/4 Vijay Kurraha <vijaykurraha@yahoo.com>:
> Team...
> Need help
> R4 ----- R1--R3---R2 ---- R5
> R4: AS3
> R1/R2/R3: AS2
> R5: AS1
> I am trying to set "Community:
> no-export" in R5... so , routes from R5 will not export into R4.....
> Here is
> my config
> R4:
> interface Ethernet0/1
> ip address 155.1.146.4 255.255.255.0
> router bgp 3
> no synchronization
> bgp log-neighbor-changes
> network 204.12.1.0
> neighbor 155.1.146.1 remote-as 2
> no auto-summary
> !
> R1:
> interface Ethernet0/0
> ip address 155.1.146.1 255.255.255.0
> interface Serial0/1
> ip address
> 155.1.13.1 255.255.255.0
> encapsulation ppp
> clock rate 64000
> !
> router eigrp 2
> network 155.1.13.1 0.0.0.0
> auto-summary
> !
> router bgp 2
> no synchronization
> bgp log-neighbor-changes
> neighbor 155.1.13.3 remote-as 2
> neighbor
> 155.1.13.3 next-hop-self
> neighbor 155.1.23.2 remote-as 2
> neighbor 155.1.23.2
> next-hop-self
> neighbor 155.1.146.4 remote-as 3
> no auto-summary
> R3:
> interface
> Serial0/2
> ip address 155.1.13.3 255.255.255.0
> !
> interface Serial0/3
> ip
> address 155.1.23.3 255.255.255.0
> interface Ethernet1/0
> ip address 155.1.37.3
> 255.255.255.0
> !
> router eigrp 2
> network 155.1.13.3 0.0.0.0
> network 155.1.23.3
> 0.0.0.0
> auto-summary
> !
> router bgp 2
> no synchronization
> bgp
> log-neighbor-changes
> network 155.1.37.0 mask 255.255.255.0
> neighbor
> 155.1.13.1 remote-as 2
> neighbor 155.1.23.2 remote-as 2
> no auto-summary
> R2:
> interface Serial1/0
> ip address 155.1.0.2 255.255.255.0
> encapsulation
> frame-relay
> frame-relay map ip 155.1..0.5 205 broadcast
> no frame-relay
> inverse-arp
> !
> interface Serial1/1
> ip address 155.1.23.2 255.255.255.0
> encapsulation ppp
> clock rate 64000
> !
> router eigrp 2
> network 155.1.23.2
> 0.0.0.0
> auto-summary
> !
> router bgp 2
> no synchronization
> bgp
> log-neighbor-changes
> neighbor 155.1.0.5 remote-as 1
> neighbor 155.1.13.1
> remote-as 2
> neighbor 155.1.13.1 next-hop-self
> neighbor 155.1.23.3 remote-as
> 2
> neighbor 155.1.23.3 next-hop-self
> no auto-summary
> and
> R5:
> interface
> Serial0/0
> ip address 155.1.0.5 255.255.255.0
> encapsulation frame-relay
> frame-relay map ip 155.1.0.2 502 broadcast
> no frame-relay inverse-arp
> !
> interface Ethernet0/1
> ip address 155.1.5.5 255.255.255.0
> half-duplex
> !
> router bgp 1
> no synchronization
> bgp log-neighbor-changes
> network 155.1.5.0
> mask 255.255.255.0
> neighbor 155.1.0.2 remote-as 2
> neighbor 155.1.0.2
> send-community
> neighbor 155.1.0.2 route-map ABCD out
> no auto-summary
> access-list 2 permit 155.1.5.0
> route-map ABCD permit 10
> match ip address 2
> set community no-export
> When I check R2.. it shows Community: no-export
> R2#sh ip bgp 155.1.5.0
> BGP routing table entry for 155..1.5.0/24, version 12
> Paths: (1 available, best #1, table Default-IP-Routing-Table, not advertised
> to EBGP peer)
> Flag: 0x820
> Advertised to update-groups:
> 3
> 1
> 155.1.0.5 from 155.1.0.5 (155.1.45.5)
> Origin IGP, metric 0,
> localpref 100, valid, external, best
> Community: no-export
>
> But R3 is not
> showing no export
> R3#sh ip bgp 155.1.5.0
> BGP routing table entry for
> 155.1.5.0/24, version 16
> Paths: (1 available, best #1, table
> Default-IP-Routing-Table)
> Not advertised to any peer
> 1
> 155.1.23.2 from
> 155.1.23.2 (155.1.2.2)
> Origin IGP, metric 0, localpref 100, valid,
> internal, best
>
> ... and I can see the routes in R4...
> R4#sh ip bgp
> BGP table version is 18, local router ID is 4.4.4.4
> 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
> *>
> 155.1..5.0/24 155.1.146.1 0 2 1 i
> *>
> 155.1.37.0/24 155.1.146.1 0 2 i
> *>
> 204.12.1.0 0.0.0.0 0 32768 i
> What I am doing
> wrong ?
> Please help.
> Thanks
> VJ
>
>
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This archive was generated by hypermail 2.1.4 : Mon Sep 01 2008 - 08:15:29 ART