10-22-2018 05:38 AM - edited 03-08-2019 04:26 PM
I am trying to troubleshoot an multicast issue with the group IP of 239.4.1.58 but when I enter the following commands
at the FHR I get nothing
sh ip igmp group 239.4.1.58
sh ip mroute 239.4.1.58
sh ip mfib 239.4.1.58
when I ask if there is a group that is working they told me 239.4.1.39
but when I enter the above commands for the .39 I don’t see anything
why is that? The server that is sourcing the multicast group is directly connected
to the switch so not sure why I cannot see this.
I tried a different mcast group that I found was working 239.18.1.113
when I enter the same commands I get information. I just don’t see anything
for the 239.4.1.39 or 58 groups. Am I doing something wrong?
Thank you in advance!!!
Solved! Go to Solution.
10-22-2018 06:53 AM
Hello Warren,
I understand now. You won't see anything in the snooping groups if only the source is connected to this switch. Do you have any special PIM configuration that would restrict what groups you are routing?
show ip pim rp mapping
What kind of switch is this? Model and version?
Hope that helps!
10-22-2018 05:42 AM
Hello Warren,
Are the source and receiver on the same vlan? If so, mroute and mfib won't show you anything. Try the following command:
show ip igmp snooping groups
Can you also paste the config for the vlan that the server is in?
Hope that helps!
10-22-2018 06:09 AM
No the source sits on vlan550 in frankfurt and the receiver is here in chicago on vlan 201
SW-FRCL-CORE1#sh ip igmp snoo grou
Vlan Group Type Version Port-List
--------------------------------------------------------------------------------
550 224.0.1.129 Dynamic - Cpu, Et22, Et7
550 239.18.1.113 Dynamic - Cpu, Et21, Et9
550 239.18.3.1 Dynamic - Cpu, Et12, Et13, Et14, Et15,
Et16, Et17, Et21, Et4, Et7,
Et8, Et9
550 239.18.3.3 Dynamic - Cpu, Et23
550 239.96.1.3 Dynamic - Cpu, Et23, Et9
550 239.96.1.5 Dynamic - Cpu, Et23, Et9
550 239.96.1.6 Dynamic - Cpu, Et13, Et16, Et23, Et4,
Et8
550 239.96.1.33 Dynamic - Cpu, Et12
550 239.96.1.41 Dynamic - Cpu, Et14
550 239.96.1.49 Dynamic - Cpu, Et17
550 239.96.4.6 Dynamic - Cpu, Et9
10-22-2018 06:10 AM
sorry left out the vlan config
SW-FRCL-CORE1#sh run inter vlan 550
interface Vlan550
description 10.97.10.0/24-Trade-LAN2
ip address 10.97.10.254/24
ip dhcp relay client
ip pim sparse-mode
10-22-2018 06:53 AM
Hello Warren,
I understand now. You won't see anything in the snooping groups if only the source is connected to this switch. Do you have any special PIM configuration that would restrict what groups you are routing?
show ip pim rp mapping
What kind of switch is this? Model and version?
Hope that helps!
10-22-2018 07:02 AM
sh ip pim rp
Group: 239.4.0.0/15Group: 239.4.0.0/15 RP: 10.16.160.20 Uptime: 968d16h, Expires: never, Override: 0
10-22-2018 07:06 AM
oh wait you know what I am on an arista switch sorry but amazingly enough the cisco
commands work. I don't see any special routing that would prevent it. That is weird
why 239.4.1.39 works but now 239.4.1.58. Anyways thank you for your help let me
ask the arista guys. Sorry I forgot we had arsita switches as well. But appreciate the
help!!!
10-22-2018 07:52 AM
Just a FYI I rechecked the PIM RP and fond out that I had 2 entries
ip pim rp-address 10.16.160.20 239.4.0.0/15
ip pim rp-address 10.103.68.1 239.4.1.58/32
the more specific one was the issue as that is a dead so when I removed the specific one
ip pim rp-address 10.103.68.1 239.4.1.58/32
all worked. Thank you breslzer for your help even though it was on another platform
Thank you sir!!!!!
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