From: Dave Williams (kapsi1911@hotmail.com)
Date: Fri Jul 06 2007 - 11:07:14 ART
Yes, that's what most of the reading material says, but I started second
guessing it when I tried it and it didn't work. When I redistribute my EIGRP
routes into MPBGP the cost community is not created please look at the
following:
PE2#show ip bgp vpnv4 vrf cus1 172.16.20.0/24
BGP routing table entry for 1:5:172.16.20.0/24, version 9
Paths: (1 available, best #1, table cus1)
Advertised to update-groups:
1
Local
10.0.4.1 from 0.0.0.0 (65.202.0.2)
Origin incomplete, metric 2297856, localpref 100, weight 32768, valid,
sourced, best
Extended Community: RT:1:5 0x8800:32768:0 0x8801:1:640000
0x8802:65281:1657856 0x8803:65281:1500,
mpls labels in/out 18/nolabel
It should be listed under Extended communities, but it's not. Any idea why?
Dave
>From: sam s <samarth_04@hotmail.com>
>To: Dave Williams <kapsi1911@hotmail.com>
>CC: <ccielab@groupstudy.com>
>Subject: RE: MPLS CE-PE EIGRP routing for backdoor links
>Date: Fri, 6 Jul 2007 10:50:01 +0530
>
>
>The eigrp costcommunity feature makes the PE router compare the eigrp
>routes and vpnv4 bgp routes with the metric value of eigrp and does not
>take into account of the AD.
>The mpbgp routes carry the metric's of eigrp through extended community.
>
>HTH
>SAMARTH
>
> > From: kapsi1911@hotmail.com> To: ccielab@groupstudy.com> Subject: MPLS
>CE-PE EIGRP routing for backdoor links> Date: Fri, 6 Jul 2007 00:59:53
>-0400> > Hello all,> > I've been reading up on the BGP cost community for
>EIGRP backdoor > enviorments and I'm a bit confused. My understanding is
>that it's use is > suppose to (by default) make a PE router choose a
>PE-to-PE IBGP route over > an EIGRP internal backdoor route.> > So, let's
>say I have a PE router that is learning the same route from > another PE
>(across my MPLS cloud) as well as a CE router (running EIGRP). So > even
>though the CE learned route is going to have a lower AD (90), my >
>understanding of this feature is that it allows the two routes (IBGP & >
>EIGRP) metrics to be compared and picked based on low metric? The IBGP
>route > usually prefered because the EIGRP metric does not increase over
>the MPLS > cloud.> > Question #1 - Is my understanding of this feature
>correct as it pertains to > EIGRP MPLS VPN PE-CE> with Backdoor Links . I'm
>aware of the BGP cost > community, but some additions> seem to have been
>made to support EIGRP backdoor > connections without having to> alter the
>AD manually?????> > Question #2 - I'm ruinning 12.2(25)S11 but my PE
>routers aren't creating > pre-poi community (128)> entries for my EIGRP
>redistributed routes. Needless to > say my PE router on the> other end
>doesn't recieve this community. From the > reading I've done, my PE> router
>should create this community automatically during > EIGRP-to-MPIBGP>
>redistribution.> > > Here is the PE router's config that IS NOT creating
>the cost community for > 172.16.20.0/24 when it is redistributed into BGP
>from EIGRP:> > router eigrp 1> auto-summary> !> address-family ipv4 vrf
>cus1> network 10.0.0.0> default-metric 64 100 255 1 1500> no auto-summary>
>autonomous-system 1> exit-address-family> !> router bgp 1> no
>synchronization> bgp log-neighbor-changes> neighbor 65.202.0.1 remote-as 1>
>neighbor 65.202.0.1 update-source Loopback0> no auto-summary> !>
>address-family vpnv4> neighbor 65.202.0.1 activate> neighbor 65.202.0.1
>send-community both> exit-address-family> !> address-family ipv4 vrf cus1>
>redistribute eigrp 1> no auto-summary> no synchronization>
>exit-address-family> !> > PE2#show ip bgp vpnv4 vrf cus1 172.16.20.0/24>
>BGP routing table entry for 1:5:172.16.20.0/24, version 9> Paths: (1
>available, best #1, table cus1)> Advertised to update-groups:> 1> Local>
>10.0.4.1 from 0.0.0.0 (65.202.0.2)> Origin incomplete, metric 2297856,
>localpref 100, weight 32768, valid, > sourced, best> Extended Community:
>RT:1:5 0x8800:32768:0 0x8801:1:640000> 0x8802:65281:1657856
>0x8803:65281:1500,> mpls labels in/out 18/nolabel> > > Anyone able to shed
>some light?> > Thanks,> Dave> >
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