From: sam s (samarth_04@hotmail.com)
Date: Fri Jul 06 2007 - 02:20:01 ART
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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