From: mark.2.johnson@bt.com
Date: Sat Jul 07 2007 - 14:56:37 ART
Hi Dave,
It so happens I did some labbing around this a couple of months ago and
was experiencing the same issues as you. What I did is, complete all
your redistribution within the EIGRP address family first, then complete
the redistribution in MPBGP and that should work.
The other workaround is to change the AD of Ex EIGRP 170, to 210, so it
will prefer the MPBGP route and not the external.
Regards,
Mark Johnson CCIP CCNP| TDA | BT Global Services
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dave Williams
Sent: 06 July 2007 15:07
To: samarth_04@hotmail.com
Cc: ccielab@groupstudy.com
Subject: RE: MPLS CE-PE EIGRP routing for backdoor links
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
>-0400> > 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
>cus1> auto-summary>
>autonomous-system 1> exit-address-family> !> router bgp 1> no
>synchronization> bgp log-neighbor-changes> neighbor 65.202.0.1
>synchronization> 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
>exit-address-family> 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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