11-19-2003 04:00 PM - edited 03-02-2019 11:51 AM
I'm having a problem on a Cat6513 with a MSFC where I cannot get multicasting working between two VLAN interfaces if they are configured with anything besides dense mode. Here's my config:
!
ip multicast-routing
!
!
!
interface Loopback0
ip address 10.251.1.1 255.255.255.0
ip pim sparse-dense-mode
!
interface Vlan10
ip address 10.10.200.2 255.255.255.0
ip helper-address 10.11.200.10
no ip redirects
ip pim sparse-dense-mode
ip rgmp
standby ip 10.10.200.1
standby priority 140
standby preempt
!
interface Vlan105
description Server Farm VLAN
ip address 10.11.200.2 255.255.255.0
ip helper-address 10.11.200.10
no ip redirects
ip pim sparse-dense-mode
ip rgmp
standby ip 10.11.200.1
standby priority 130
standby preempt
ip classless
ip route 0.0.0.0 0.0.0.0 10.254.1.1
no ip http server
ip pim send-rp-announce Loopback0 scope 32
ip pim send-rp-discovery Loopback0 scope 32
!
!
If it is configured this way, the multicast client on VLAN10 cannot receive the stream from the server on VLAN105. If I change VLAN10 to be "ip pim dense-mode", it will work. Both of these interfaces are the active HSRP interfaces I've looked and looked over how to configure this any I can't find anything wrong. I can see the IGMP join requests come in to VLAN10 from the client but it doesn't seem to actually join. Any ideas?
11-19-2003 05:45 PM
There is a good document at ftp://ftpeng.cisco.com/ipmulticast/autorp.html regarding auto-rp configuration and diagnostics.
Section 4 is useful as it contains a diagnostics flowchart you can follow. Section 5 contains common errors, such as possible misconfiguration on other routers etc.
Let me know how you go as I believe one of our clients has a similar problem.
11-19-2003 06:33 PM
My Working setup for sparse PIM is as below, check out if you can do something...
interface Vlan6
description ## Back Bone##
ip address 10.x.x.1 255.255.255.0
ip helper-address 10.y.x.x
no ip proxy-arp
ip pim query-interval 180
ip pim sparse-dense-mode
ip multicast ttl-threshold 15
no ip route-cache cef
ip igmp query-interval 180
ip cgmp( instead of rgmp)
no ip mroute-cache
Also on the L2 , do you have cgmp enabled.
set cgmp enable
set cgmp leave enable
11-19-2003 08:44 PM
Unfortunately, CGMP does not even appear to be an option on this version of CatOS (7.6(1)):
Server_Farm (enable) set c?
cam Set CAM table entry
cdp Set cdp, use 'set cdp help' for more info
channelprotocol Set channeling protocol for a module
config Set system configuration parameters
cops Set COPS information
crypto To generate RSA key pairs for the host
Server_Farm (enable)
11-19-2003 08:42 PM
According to the flow chart, the problem I am having is local to this MSFC but the flow chart does not go any deeper than that. Since these VLAN interfaces are on the same MSFC that is the RP, I would think the configuration would work. I'm still not sure what the problem is. According to all the documentation, in sparse-dense mode, if the RP is unreachable, it should revert back to dense mode and work, which does not seem to be happening.
11-19-2003 09:34 PM
Well you've got RGMP enabled on the interfaces. Here are some things you can check:
1. I presume you're using 6500 in hybrid mode. Have you enabled RGMP on the switch? set rgmp enable
2. IGMP snooping is a prerequisite for RGMP. You need to enable IGMP snooping on the switch. set igmp enable
3. Make sure the loopback interface on the router has RGMP as per the other two VLAN interfaces.
11-20-2003 07:15 AM
Yes, it is a 6500 in hybrid mode. RGMP and IGMP snooping have both been enabled on the switch. I tried to enable RGMP on the loopback but got the message:
"RGMP not supported on non-802 media"
11-20-2003 04:53 PM
I was going to test your environment in our labs but our 6500 is in use at the moment.
I guess the 'last-resort' things I would try are (in order):
1. Disable RGMP all around.
2. Manually configure the rendezvous point.
3. Place multicast in sparse mode only.
and then work from there depending on the results.
11-21-2003 01:28 AM
Hello,
I would be interested to see the output of
sh ip pim rp mapping
Regards
Ian
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