[c-nsp] 6VPE deployment Issue (Core router need configure IPv6 address or not?)

Aaron aaron1 at gvtc.com
Wed Aug 1 16:45:57 EDT 2012

My understanding is...

P router isn't seen in vpvn4, unless on trace route because of ttl
propagate....you can disable it and make the mpls core invisible

I recall someone (Pshem) telling me that for 6vpe the address family for
vpnv6 needs to be enabled on pe's (6vpe neighbors you choose to do 6vpe
with) (and route reflector if you choose to have one)

Traces and pings from ce to ce I don't believe by design of mpls l3vpn's (4
or 6) are supposed to see core.  

Don't know much about qos, but be aware of single label situation where php
causes exp bits to be lost prior to pe arrival... your case(s) of l3vpn's
vpnv4/6 shouldn't apply since the have stacked labels.


Hu please check me on all this as I'm fairly new to this myself.  I'm at the
beginnings of my 6vpe deployment too.  This community is so knowledgeable
that I will look for others to confirm or deny my understandings and then
grow from it.


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Xu Hu
Sent: Wednesday, August 01, 2012 10:30 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] 6VPE deployment Issue (Core router need configure IPv6
address or not?)

Hi All Experts,

Let's say the topology as below:
PE-CE protocol OSPF, core running OSPF as IGP, on top have MPLS/VPN, LDP.

In the IPv4 situation, when i ping from CE-1 to CE-2, will see the next-hop
of P router.

For the IPv6 situation, PE-1 and PE-2 running 6VPE, established the VPNv6
neighbor with each other, as we know the core router is unaware of IPv6, so
by right we just need to configure the IPv6 address in PE interface which
towards CE side.

My question is if we don't configure the IPv6 address in the core, so how
the traceroute and ping work?

Also another thing is the QOS deployment, if we don't configure the IPv6
address, the DSCP value in the core will change or not by default? Or we
must map the DSCP value to EXP value in the ingress router?

Thanks advance for any comments,
Hu Xu
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