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SINGLE VRF - MULTICAST ROUTING - LAYER 3 SWITCH (CISCO 9300)

Oleksandr Y.
Beginner
Beginner

Hello Community, another conundrum that I am trying to solve - seems like I am very close to solution but there might be some concepts I don't have a full grasp on - so asking help from the community Here is a visual: 

Capture.PNG

 Below is all the related config I have on the L3 SW (CISCO 9300)

 

ip multicast-routing vrf SAT-EDGE distributed

!

interface Vlan106
ip vrf forwarding SAT-EDGE
ip address 192.168.16.1 255.255.255.0
ip pim passive
load-interval 30
end

!

interface Vlan254
ip vrf forwarding SAT-EDGE
ip address 192.168.254.1 255.255.255.0
ip pim dense-mode
ip igmp static-group 239.192.12.1
load-interval 30
end

 

My LAB is a little bit more complicated than this, but I wanted to simplify and FOCUS on what is not working actually. I don't have any equipment capable of IGMP so I am using mostly static configurations everywhere. 

In a nutshell when I launch Multicast Traffic from the Source I am seeing it arrive on interface VLAN106 (I will actually have multiple sources eventually, such as VLAN 206, 306, etc... ) but the Receivers are all downstream of this VLAN 254 interface.

In the output of "ip mroute ..." I am not seeing an ingress interface and I am sure I am missing something either VRF Related configuration to support Multicast or vice-versa, but I can not seem to put my finger on it

 

L2-SW-9300#sh ip mroute vrf SAT-EDGE
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector, p - PIM Joins on route,
x - VxLAN group
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.192.12.1), 17:22:45/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan254, Forward/Dense, 16:48:10/stopped

(*, 224.0.1.40), 17:31:46/00:02:38, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan254, Forward/Dense, 17:31:46/stopped

Any ideas will be very much appreciated  

2 Replies 2

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hello @Oleksandr Y. ,

a)

why you have ip pim passive under interface VLAN 106 could you try to use ip pim dense-mode instead ?

 

b)

check the TTL of the multicast sources must be greater then 1 or they are silently dropped on the switch

 

Hope to help

Giuseppe

 

 

Hi again Giuseppe seems like you are the main responder on my questions Thanks for that. 

I tried all kinds of combinations, ip pim passive works fine as well because I have it set up further upstream (closer to the multicast source) and it does the job - but yes I have tried ip pim dense everywhere to no avail. 

 

TTL is set properly as well - we discussed this in one of the previous posts  

https://community.cisco.com/t5/routing/cisco-9300l-multicast-routing/m-p/4182859#M342321

 

Any other ideas ? I mean I see the traffic coming in on VLAN 106 - I see Multicast packet count ... and since this interface and Interface Vlan254 are both in the same VRF I figured by forcing Vlan254 interface to send traffic out of it using the "ip igmp static-group" would actually work ... I even tried disabling ip igmp snooping for vlan 254 and 106 but still no luck  

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