Re: MPLS EIGRP backdoor links - SoO

That is correct. The CE router shows the SOO attribute when you issue the
"show ip eigrp topology XXXX" command.

X representing the prefix with SoO attached.

Paul

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
> From: Ben Hughes <bhughes_at_imc.net.au>
> Reply-To: Ben Hughes <bhughes_at_imc.net.au>
> Date: Wed, 2 Nov 2011 09:02:07 +1100
> To: Tom Kacprzynski <tom.kac_at_gmail.com>, Christian Hunter
> <stasis416_at_gmail.com>
> Cc: Cisco certification <ccielab_at_groupstudy.com>
> Conversation: MPLS EIGRP backdoor links - SoO
> Subject: Re: MPLS EIGRP backdoor links - SoO
> 
> Hi Tom,
> 
> I don't believe backbone routers running EIGRP will have the SoO attribute.
> The doc is talking about EIGRP running on the PE-CE side.  The SoO attribute
> is copied into EIGRP topology table of EIGRP running in the customer VRF.
> 
> Cheers,
> Ben.
> 
> From: Tom Kacprzynski <tom.kac_at_gmail.com<mailto:tom.kac_at_gmail.com>>
> Reply-To: Tom Kacprzynski <tom.kac_at_gmail.com<mailto:tom.kac_at_gmail.com>>
> Date: Wed, 2 Nov 2011 07:24:40 +1100
> To: Christian Hunter <stasis416_at_gmail.com<mailto:stasis416_at_gmail.com>>
> Cc: Cisco certification
> <ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>>
> Subject: Re: MPLS EIGRP backdoor links - SoO
> 
> Hi Christian,
> Thanks for responding. I'm reading this section from the doc you attached
> 
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/s_mvesoo.html#wp104974>
0
> 
> *"**When an EIGRP routing process on the PE router redistributes BGP VPN
> routes into the EIGRP topology table, EIGRP extracts the SoO value (if one
> is present) from the appended BGP extended community attributes and appends
> the SoO value to the route before installing it to the EIGRP topology
> table. EIGRP tests the SoO value for each route before sending updates to
> CE routers. Routes that are associated with SoO values that match the SoO
> value configured on the interface are filtered out before they are passed
> to the CE routers. When an EIGRP routing process receives routes that are
> associated with different SoO values, the SoO value is passed to the CE
> router and carried through the CE site. "*
> 
> So if you have two backbone routers that don't run BGP, only EIGRP, how
> would they actually get a route with SoO attached so they could check if
> that route isn't a feedback from the same Site?
> 
> (ASCII topology below)
> 
> CE-----PE---MPLS---PE------CE
> -|                                       |
> -|--------------backdoor------------|
> 
> Thanks
> 
> Tom
> 
> 
> On Tue, Nov 1, 2011 at 3:08 PM, Christian Hunter
> <stasis416_at_gmail.com<mailto:stasis416_at_gmail.com>>wrote:
> 
> http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/s_mvesoo.html
> 
> See the section on "Verifying the Configuration of the SoO Extended
> Community"
> 
> SoO is a BGP ext community and is set in BGP. When EBGP is used between PE
> & CE the SOO attribute is configured via a route-map.. For other routing
> protocols the SoO attribute can be applied to routes learned through a
> particular VRF instance during the re-distribution into BGP..  I don't
> think the IGP has any knowledge since it's just a BGP ext. community that
> is used for loop prevention.
> 
> Hope that helps.
> 
> Christian Hunter
> 
> On Tue, Nov 1, 2011 at 3:14 PM, Tom Kacprzynski
> <tom.kac_at_gmail.com<mailto:tom.kac_at_gmail.com>> wrote:
> 
> Hello,
> I'm working on a lab using EIGRP as the protocol for MPLS VPN. This
> scenario has a backdoor link. I'm testing the Site of Origin feature, but
> can't seem to find any way to check the actual SoO on the CE router using
> EIGRP commands. Does anyone know how/if I could do that?
> 
> I can see it in BGP table but how do I see it in EIGRP
> 
> Rack1R6#sh ip bgp vpnv4 rd 100:1 155.1.67.0/24
> BGP routing table entry for 100:1:155.1.67.0/24, version 338
> Paths: (1 available, best #1, table VPN-A)
>   Advertised to update-groups:
>         1
>   Local
>     0.0.0.0 from 0.0.0.0 (150.1.6.6)
>       Origin incomplete, metric 0, localpref 100, weight 32768, valid,
> sourced, best
>       Extended Community: SoO:100:60 RT:100:1
> Cost:pre-bestpath:128:28160                  <----------------------
>         0x8800:32768:0 0x8801:10:2560 0x8802:65280:25600 0x8803:65281:1500
>       mpls labels in/out 22/nolabel(VPN-A)
> 
> 
> 
> Thank you,
> 
> Tom
> 
> 
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