You are 100% correct! Thank you very much. I have read that article
now and it all seems crystal clear.
I was surprised to see that my ios did not support it, only being
version 12.4(15)T9, when I believe ipexpert use something very close,
but I am logging on now to get a better version and upgrade my lab.
Want to experience configuring with and without mdt safi.
Thanks again!
Sent from my iPhone
On 16 Aug 2010, at 14:56, "Roger Pfaeffli" <[email protected]> wrote:
Hi Mark,
Without knowing the topology and the question of the workbook I can
give you
the following answer:
Option 1 - new style: you use the MDT address family in which you will
"signal" the address of the source PE and the default MDT group.
NOTE: Your
IOS has to support this MDT address family!
Option 2 - old style: In the old IOS, Cisco uses a proprietary
workaround
which prevents from using the MDT address family. IOS is using the BGP
extended community attribute with type 2 routed distinguisher, to
distinguish from other vpnv4 addresses. I think this is the option
in your
case. Check out your routes, I'm sure you will find the following in
your
vpnv4:
sh ip bgp vpnv4 all
Route Distinguisher: 2:64512:1313
*> 138.187.1.2/32 0.0.0.0
Do you see the notation 2:x:y? This indicates your MDT route!
Check out the following link on the DocCD which does have nice infos:
http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_cfg_mc_v
pn_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1055404
regards
Roger
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Mark Beynon
Sent: Sonntag, 15. August 2010 00:00
To: [email protected]
Subject: [OSL | CCIE_RS] Vol 1, lab 30 Mpls VPN Multicast.....
Hi guys!! Sorry to seek your assistance yet again, but it is a the
first
time I have played with mpls VPN multicast and havin some problems.
I done the lab, and got everything up and running easy enough. In
VPNA I
could ping the multicast group from ce, across the mpls l3 VPN core
to the
multicast subcriber ce. Likewise VPNB.
Quite happy with myself at this point. Mdt and tunnels up and
working fine.
I review the the DSG, and I have done everything correct, except I
didn't
configure an mdt address family in bgp! It still seems to work fine.
I have done some reading to try and understand why it's needed, and
why
mines working. Buy I'm not clear...
I understand that no RP is needed in SSM as there are no shared trees.
I now understand that mbgp mdt address family is needed so that each
pe can
be told what sources it needs to register to. (is that right?)
I'm guessing in my scenario it doesn't actually need the mdt because
it
knows about the remote pe's as it is configured in vpnv4 family (?).
If we had a non configured remote pe, such as via route reflectors it
wouldn't know to subscribe, without the mdt family.
Is this right?
I have been searching for the answer but not managed to find. Now
watching
vlecture on mpls multicast, but unfurtunetly they voted for any source
multicast, so don't think it will be confirmed here :(
Appreciate any clarity!
Sent from my iPhone
_______________________________________________
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please
visit www.ipexpert.com
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
