From: But Nicky (lyredhair@gmail.com)
Date: Fri Dec 19 2008 - 14:17:41 ARST
Hi Peter,
You should check BGP route-reflector for IBGP peer and IGP routing protocol.
- When R3 receive routes from IBGP peer R2, R3 do not advertise these
routes to any IBGP peer without "route-reflector".
- Furthermore, when R3 receive BGP routes which is advertised by R5 with
next-hop is 155.1.25.5, but R3 do not have route to network
155.1.25.0/24(You did not advertise network
155.1.25.0/24 into EIGRP), so that these BGP routes are "invalid" routes
in R3 ==> R3 do not advertise it to R1 although of absence route-reflector
as above.
Regards,
But Nguyen,
On Wed, Dec 17, 2008 at 12:42 PM, Andy Hogard <andyhogard@gmail.com> wrote:
> Yep, all communtities are useless unless you use the send-community keyword
> along. That's how they are designed to work. Also remember that community
> is
> a Optional Transitive attribute, but will transit to any neighbor unless
> explicity defined to do so.
>
> Just my two cents.
>
> HTH,
> Andy.
>
> On Wed, Dec 17, 2008 at 9:43 AM, Peter Chuba <ptchuba@live.com> wrote:
>
> > I had the neighbor send-community on R5. After your replies I configured
> > the
> > send-community for R1s neighbor statement on R2. This produced the
> desired
> > effect.
> >
> >
> >
> > Thanks Jonny and Hobbs
> >
> >
> >
> > Final configs
> >
> > R5
> >
> > !
> >
> > interface Loopback0
> >
> > ip address 155.1.5.5 255.255.255.0
> >
> > !
> >
> > interface Serial1/0
> >
> > ip address 155.1.0.5 255.255.255.0
> >
> > encapsulation frame-relay
> >
> > serial restart-delay 0
> >
> > no dce-terminal-timing-enable
> >
> > frame-relay map ip 155.1.0.2 502
> >
> > no frame-relay inverse-arp
> >
> > frame-relay lmi-type cisco
> >
> > !
> >
> > 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 COMMUNITY out
> >
> > no auto-summary
> >
> > !
> >
> > route-map COMMUNITY permit 10
> >
> > set community no-export
> >
> > !
> >
> >
> >
> > R2
> >
> > interface Serial1/0
> >
> > ip address 155.1.0.2 255.255.255.0
> >
> > encapsulation frame-relay
> >
> > serial restart-delay 0
> >
> > no dce-terminal-timing-enable
> >
> > frame-relay map ip 155.1.0.5 205
> >
> > no frame-relay inverse-arp
> >
> > frame-relay lmi-type cisco
> >
> > !
> >
> > interface Serial1/1
> >
> > ip address 155.1.23.2 255.255.255.0
> >
> > serial restart-delay 0
> >
> > no dce-terminal-timing-enable
> >
> > !
> >
> > router eigrp 2
> >
> > redistribute connected metric 1 1 1 1 1
> >
> > network 155.1.23.0 0.0.0.255
> >
> > 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 send-community
> >
> > neighbor 155.1.23.3 remote-as 2
> >
> > no auto-summary
> >
> >
> >
> > R1
> >
> > interface FastEthernet0/0
> >
> > ip address 155.1.146.1 255.255.255.0
> >
> > duplex auto
> >
> > speed auto
> >
> > !
> >
> > interface Serial1/1
> >
> > ip address 155.1.13.1 255.255.255.0
> >
> > serial restart-delay 0
> >
> > no dce-terminal-timing-enable
> >
> > !
> >
> > !
> >
> > router eigrp 2
> >
> > redistribute connected metric 1 1 1 1 1
> >
> > network 155.1.13.0 0.0.0.255
> >
> > auto-summary
> >
> > !
> >
> > router bgp 2
> >
> > no synchronization
> >
> > bgp log-neighbor-changes
> >
> > neighbor 155.1.13.3 remote-as 2
> >
> > neighbor 155.1.23.2 remote-as 2
> >
> > neighbor 155.1.146.4 remote-as 3
> >
> > no auto-summary
> >
> > !
> >
> >
> >
> > From: Jonny English [mailto:redkidneybeans@gmail.com]
> > Sent: Wednesday, December 17, 2008 4:51 AM
> > To: Peter Chuba
> > Cc: ccielab@groupstudy.com
> > Subject: Re: BGP community no-export confusion
> >
> >
> >
> > Do you have the send-community keyword?
> >
> > Can we see your configs please.
> >
> > On Wed, Dec 17, 2008 at 4:40 PM, Peter Chuba <ptchuba@live.com> wrote:
> >
> > Hi experts, I need a little help. I've got this setup
> >
> >
> >
> > R4-----R1-----R3-------R2-----R5
> >
> >
> >
> > R4 is in AS3, R1,3,2 are in AS2 and R5 in AS1
> >
> >
> >
> > On R5 I set the bgp community no-export for all routes advertised to R2.
> I
> > see the attribute on the routes in R2 but yet the routes get advertised
> to
> > R4 in AS3. I checked R1 and it has the routes without the attribute. I
> > thought this attribute was still supposed to be on the routes when
> > advertised to iBGP neighbors?
> >
> >
> >
> > Thanks
> >
> > Peter
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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> >
> >
> >
> >
> >
> >
> >
> >
>
>
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>
>
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>
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