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RE: RFC2547 VPN discussion group? (With an inter-AS VPN question )
From: "Yu Ning" <yuning () ns chinanet cn net>
Date: Tue, 22 May 2001 16:39:51 +0800

Hi nanog,

I've solved the problem mentioned in my former letter. I'm too over-worked
and forget to add "next-hop-self" in the PE1 to PE2 MP-iBGP peer, so no
PE can reach PE1 in other AS, unless the directly connected one. But Cisco
MPLS VPN command seems not very friendly,:-) After add the "next-hop-self"
in the VPNV4 section, the MP-iBGP peer won't refresh itself, and I have 
no command to clear the VPNV4 peer, then I have to delete the config
and paste it again to trigger the new update.  I hope the "clear ip b n
vrf xxx.xxx " can be added into IOS soon,:-)


-----Original Message-----
From: owner-nanog () merit edu [mailto:owner-nanog () merit edu]On Behalf Of
Yu Ning
Sent: Tuesday, May 22, 2001 10:18 AM
To: Nanog-Post
Subject: RFC2547 VPN discussion group? (With an inter-AS VPN question )

Hi All,

Does anyone know RFC2547 VPN discussion group ? I can only find 
generic MPLS
discussion from IETF. Better cisco oriented, because we use Cisco RFC2547

Here is one of the problem we encountered now. Can anyone help ?

We have 3 PEs connected with 3 CEs. PE1, PE2 are in the same AS4134, while
PE3 in AS41340.  It's not so luck that PE1 and PE3 is not back-to-back 
connected, but can be reached via a tag-switching enabled intermediate
network. PE1-PE2 has MP-iBGP peer, while PE1-PE3 has MP-eBGP peer.

Then we verify the traffic, and see that CE3, CE1 can ping each other,
while CE3 can't ping CE2 ? But all three CEs can see prefix from other 

   AS4134                                    AS41340

|----|       |---|                    |---|
|CE1 |-------|PE1|--(Tag switching )--|PE3|
|----|       |---|    enabled inter-  |---|
               |      mediate network   |
               |                        |
               |                      |---|
               |                      |CE3|
|----|       |---|                    |---|
|CE2 |-------|PE2|
|----|       |---|

BTW, We run PE on IOS Version 12.1(5)T6


Yu Ning

(Mr.) Yu Ning, Chief Engineer
ChinaNET(AS4134) Sr. Sup.& New Sev. R&D
Internet Product Dep. DCB, China Telecom
Beijing, P.R.China +86-10-62072357/62072354

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