Re: mpls l2vpn between 2 asr901's

Great news Aaron. What code were you running on the ASRs?

Regards,
 Joe Sanchez

On Mar 27, 2012, at 6:19 PM, "Aaron" <aaron1_at_gvtc.com> wrote:

> Hey guess what, I got a very sharp cisco tac engineer on the phone and he
> was able to find a fix
>
> The other day I couldn't get ospf to work between the asr901 and
> 9k...actually it worked for a moment then stopped...it was sort of weird.
> So I resorted to a static default route.
>
> The tac eng didn't think that mpls would work with a static default, as he
> mentioned that labels will need to bind to specific underlying igp
> prefixes...(I wondered what the global command "mpls ip default-route" was
> for but not sure I got a good answer out of that) so he proceeded to do what
> I did the other day...turn up ospf. We did enable ospf and we got neighbor
> state up and routes and labels in lfib (sho mpls for) but all labels said
> "no label" . strangely, the 9k didn't have a route to the loopback address
> of the 901. The asr9k when doing "sh ip ospf dat router (ipaddress of
> asr901) it should at top of display something about "router not
> reachable"....he added ip ospf net point to point to the gige interface of
> the asr9k and the svi of the asr901 and BAM it worked.
>
> The link between 9k and 901 is a /30. I didn't know you had to use ip ospf
> point-to-point on Ethernet links addressed as /30's ?! anybody ever seen
> that before?
>
> This 9k was running xr 4.1.2
>
> However the other side of the l2vpn (9k_b and 901_b)I had same hardware BUT
> that 9k was running xr 4.0.1...I DIDN'T have to do that ip ospf net p-to-p
> trick and it just worked on this side. Why the different behavior? Xr
> version ?
>
> Ce_a-----901_a-----/30----9k_a----/30-----9k_b-----/30-----901_b-----ce_b
>
> Aaron
>
> p.s. I did see that YOU MUST have link up/up on AC (attchement circuit)
> going from pe to ce or the PW will NOT come up. I read it online last night
> and saw it first-hand today....after it all got working I shutdown ce_b gig
> interface and the pw between asr9k's went down.
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Aaron
> Sent: Tuesday, March 27, 2012 10:29 AM
> To: ccielab_at_groupstudy.com
> Subject: mpls l2vpn between 2 asr901's
>
> I'm not able to get the pw to come up between 2 different asr901's. anybody
> know how?
>
>
>
> I have the xconnects on the g0/0 interfaces that I wish to emulate L2
> between on each side. I can ping the xconnect endpoint on each side. I
> have an mpls (asr9k) network in the middle between the two 901's..the 901's
> and 9k's do see each other as ldp neighbors..also after the xconnect is
> config'd on the 901's I do see the targeted ldp session fireup between the
> 901's.
>
>
>
> But "sho mpls l2 vc" and "sh xcon all" both show the pw portion ("segment2")
> as DN (down)..the ac (segment1) on both sides is up.
>
>
>
> Aaron
>
>
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Received on Tue Mar 27 2012 - 19:50:08 ART