Hi IPexperters,Was doing a lab on Proctor Labs kit, making up my own MPLS VPN
scenarios. I wish I'd paid more attention to the exact details now, but I think
I was using R9 to be a PE router. (I cannot swear it was R9 but the detail is
not important for my query). Anyway, whatever router it was, happily accepted
all the usual BGP VPNv4 unicast address family command and LDP command, but
when you looked at the "show vpvnv4.....summary" command, it showed some weird
state in the State/Prefix column. It was (No<something>). I oogle-googled it,
and it said this was down to a problem in capabilities exchange between the
routers. Both were already running IPv4 BGP between them, using the "no bgp
def ipv4" command. My query is very simple, on Protcor Labs kit, which routers
can be used as PE routers and which should be avoided as using as PEs? I think
R2, R4, R5 and R6 are safe bets. Any others? I'm sure Marko will know this off
the top of his head. Another odd one I came acros
s as well, this time on R5. I had sparse-dense mode set up on a hub and spoke
frame relay cloud, with R2 as hub, with NMBA mode configured on the multipoint
sub interface. R2 was configured as RP for the group in question, and R5 had
proper RP mapping, learned via auto-rp. The other spoke on the frame cloud,
R4, had had its ethernet port join a group for which it knew R2 as RP.
Basically, traffic flow should have been in and out of the hub, from one spoke
to another. When I did a: ping <group> source <lan interface> on R5, it would
not source packets. Absolutely nothing was received at the hub when I did a
"debug ip mpacket". However, when I looked on the hub, there was multicast
state for the group, but not sourced from the LAN interface, but from the frame
IP address on R5. R4 received no traffic whatsoever, but it too had correct RP
mappings. Frame maps were set up for broadcast and OSPF was running across the
frame cloud. SPT threshold was set high to stop any RPT
to SPT switchover. Is there any restriction about running multicast ping,
sourced from a given interface? The source interface was known to the OSPF
domain. Sorry I don't have configs for this lot, just wondered if anyone had
come across anything similar? Regards, George.
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