Multicast Routing Not Working End to End

[conor.maton]

Hello all,

I have an issue that has got a lot of us stumped regarding multicast and need some support. Specific multicast configs from the equipment (includes 'show ip route' & 'show ip mroute') and a topology of the network are attached.

We have a multicast client connected to Core Switch 01 (192.168.227.116) which needs to join multicast group 239.192.0.22. The RP is 192.168.1.74 which is a subnet on the Core Switch 02 LAN.

We have PIM SM running on all connecting L3 interfaces, configured the RP on Core Switch 01 and can confirm all network devices can route to 192.168.1.74. However when we test multicast from the 192.168.227.226 client, we cannot see anything onwards from Routers 01 and 02 so the issue looks to be between Core Switch 01 and the aforementioned Routers

Does anybody have any ideas of what is misisng on the attached configs or what else we could try please? We have had a number of engineers review this and nothing is obvious. One thing that to note: Routers 01 & 02 are partaking i HSRP: there is a staic route from Core Switch 01 to the HSRP VIP so I don't know if that is causing anything.

Thanks in advance!

[Giuseppe Larosa]

Hello @conor.maton ,

yes now the output of show ip mroute from Core Switch1, R1 and R2 look like better all of them know the RP address.

The Group is pruned meaning that there is no receiver interested in this group.

So you would need a receiver for troubleshooting purposes only on the user facing interface on R2 you could add in interface mode

ip igmp join-group 239.192.0.22

Warning: this command causes the router to process packets with destination the multicast group so it shouldn't be used when a real source with a high volume stream like a video is present in the network,

About the fact the route is missing on the stack 02 I have to review your topology. what is behind stack 02 the possible source?

Edit:

the stack02 is behind the firewall have you configured the IP PIM RP address also on the firewall ?

Note: understand that this forum is worldwide and we can live in different time zones for example I live in Europe with the same time of Rome, Paris and Berlin. if you use the @ name I receive a notification and a notification e-mail.. This is handy.

Hope to help

Giuseppe

[conor.maton]

Hi @Giuseppe Larosa 

I can confirm I now have multicast end to end. I solved as follows:

• Changed from HSRP to OSPF so more like a traditional campus network
• Manually configured 'ip pim rp-address 192.168.1.74' to each L3 device

Thanks for your help with this!

[Georg Pauwen]

Hello,

are these the full configurations, or just partial ones ? Looking at the below:

Router 1

interface GigabitEthernet0/1
ip address 192.168.227.153 255.255.255.248
--> subnet 192.168.227.152 ? this is not advertised in OSPF ?
ip pim sparse-mode
standby version 2
standby 500 ip 192.168.227.158
standby 500 timers 1 3
standby 500 priority 50
standby 500 preempt
!
interface GigabitEthernet0/0/0
ip address 192.168.232.67 255.255.255.240
ip pim sparse-mode
!
router ospf 1
redistribute static subnets
passive-interface default
--> no passive-interface GigabitEthernet0/0 ? where is that interface
no passive-interface GigabitEthernet0/0/0
--> network 192.168.226.0 0.0.1.255 area 0 ? where is that network
network 192.168.232.64 0.0.0.15 area 0

Router 2

interface GigabitEthernet0/1
ip address 192.168.227.154 255.255.255.248

--> subnet 192.168.227.152 ? this is not advertised in OSPF ?
ip pim sparse-mode
standby version 2
standby 500 ip 192.168.227.158
standby 500 timers 1 3
standby 500 priority 150
standby 500 preempt
!
interface GigabitEthernet0/0/0
ip address 192.168.232.68 255.255.255.240
ip pim sparse-mode
!
router ospf 1
redistribute static subnets
passive-interface default
no passive-interface GigabitEthernet0/0/0
--> network 192.168.226.0 0.0.1.255 area 0 ? where is that network ?
network 192.168.232.64 0.0.0.15 area 0

Also, if one of your ASA interfaces manually joins an IGMP group, what is the result ?