07-16-2006 08:32 AM - edited 03-03-2019 01:21 PM
I'm setting up multicast in my network.
I've got 2 routers candidates rp for 2 different ranges of IPs
R2:
ip pim send-rp-announce scope 16 group-list 99
access-list 99 permit 225.0.0.0 0.255.255.255
-
R5:
Router(config)#ip pim send-rp-announce scope 16 group-list 99
Router(config)#access-list 99 permit 239.0.0.0 0.255.255.255
-
plus a R3 is in charge with the mapping between groups and mapping agents
Router(config)#ip pim send-rp-discovery scope 16
-
Everything's cool, even if I type
Router#show ip pim rp mapping
Group(s) 225.0.0.0/8
RP 150.1.2.2 (?), v2v1
Info source: 150.1.2.2 (?), elected via Auto-RP
Uptime: 01:46:09, expires: 00:02:45
Group(s) 239.0.0.0/8
RP 150.1.5.5 (?), v2v1
Info source: 150.1.5.5 (?), elected via Auto-RP
Uptime: 00:32:08, expires: 00:02:51
All the routers (including loopbacks) are set with
ip pim sparse-mode
+ they all have the
ip pim autorp listener
to make autorp working over sparse-mode
Everything seems to be ok.
I've joined group 225.25.25.25 and 239.39.39.39 from a 4th router.
Pinging from different devices in the network 225.25.25.25 works in some areas (in other not), where 239.39.39.39 not at all :-(
Can anybody shed light for me on the way to troubleshoot this issue?
Thanks a lot!
07-16-2006 09:20 PM
Hello bellocarico,
Did you check for RPF issues? Take a look at the group members that did not respond to your echo request. View the mroute table if downstream interfaces are being pruned, modify your tree or create a tunnel to mitigate the problem.
If you need further help, please provide a simple diagram of your multicast topology.
HTH
--Leon
* Please rate posts.
07-16-2006 11:55 PM
Pl. do debug with this command for each group and see mroute established, rpf passing and neighbour is there outside that area.
show ip mroute
show ip rpf
show ip pim neighbor
07-17-2006 02:54 AM
Topology in attachment
225.25.25.25 RP is R2 publishing it as the loopback0 150.1.2.2), SW2 is the mapping agent (150.1.8.8 still on loopback 0)
On R3 eth0 I've set an ip igmp join-group 225.25.25.25
When I try to ping from R4 it fails and this is the output of the show ip mroute 225.25.25.25 (still on R4)
(*, 225.25.25.25), 00:00:04/stopped, RP 150.1.2.2, flags: SPF
Incoming interface: Serial0/3, RPF nbr 141.1.145.5, Mroute
Outgoing interface list: Null
Where R5 says: Group 225.25.25.25 not found
But if I ping from R5 sirectly, it works...
Note, 141,1,145,4 is not an ethernet connection like the topology says, but a serial connection instead (serial0/3)
I'm reading this document right now
http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094b55.shtml#noforwardrpffail
These are the things I'm confused on:
- Is the ip igmp join-group simulating a source or destination? (I guess destination)
- Is the ping simulating a source or destination (I guess a source)
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