Re: EIGRP backdoor link on MPLS VPN and multiple SoO values

The CE can inspect the EIGRP updates coming from the backdoor link. You
configure a sitemap to do this. The CE does not have to be running BGP!

Check your packet capture again. Wireshark will not recognize the SoO
attribute included in the EIGRP packet. Look for "Type Unknown 0x0104" The
last 6 bytes of this field is the SoO! So just convert the HEX to Decimal
:-)

Cheers

-Yuri

On Mon, Feb 13, 2012 at 5:10 AM, Pierre-Alex Guanel <paguanel_at_gmail.com>wrote:

> According to paragraph 2) on page 2545 of INE CCIE R&S Lab Workbook Volume
> 1 (CCIEv4.0), when configuring PE routers of a multi-homed sites with
> different SoO values, an additional SoO interface should be configured on
> the CE routers with the backdoor links " to prevent routing loops.
>
> Diagram:
>
>
> PE1 -------------P--------P------------------PE2
> | |
> | |
> SoO=100:1 SoO=100:2
> | |
> | |
> CE1--SoO=100:1----------SoO=100:2-CE2
>
>
>
> Questions:
>
> How can a CE (acting as a backdoor) filter updates based on the site of
> origin since the CE is not running
> MBGP ?
>
> I have taken a network capture of traffic on the backdoor link, I do not
> see any extension in EIGRP carrying the SoO attribute ...
>
> Any input welcome.
>
> Thanks
>
> Pierre-Alex
>
>
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Received on Mon Feb 13 2012 - 20:47:57 ART