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Multicast not working from Cisco ACI to Cat9500

Nilay Patel
Beginner
Beginner

Problem multicast feed is not coming out from Data Center(server) to Outside network(client) but other direction multicast is working. Multicast tree(routing) are building end to end but only data is not transferring. ((( observation: traffic start initially for 1-2 seconds & stops almost looking like c9500(L3 core) blocking for some Safety. We have seen flag: T comes for few seconds on 9500 and then go away. Also notice RPF failure/ MCAST data drop at QoS/CPU level. but not sure what's casing this issue

Setup: (C9500-48Y4C(Version 17.3.4) (2x L3 Core) connected to 2x Border leaf (Cisco ACI - 4.2(7u) ). 4 links L3 connected connected to ACI 2xBL from cat9500)

Outside of Data Center Cisco ACI multicasting working perfectly fine.

9500-COR-SW-01-A #sh ip mroute | sec 239.192.198.200

(*, 239.192.198.200), 00:01:06/00:03:22, RP 192.168.254.101, flags: S

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    TwentyFiveGigE1/0/27, Forward/Sparse, 00:01:06/00:03:22

(192.168.102.247, 239.192.198.200), 00:00:56/00:02:37, flags:       (Missing flags after few seconds)

  Incoming interface: TwentyFiveGigE1/0/14, RPF nbr 192.168.253.238

  Outgoing interface list:

    TwentyFiveGigE1/0/27, Forward/Sparse, 00:00:56/00:03:22

##########

Plus traffic getting P - Pruned

9500-COR-SW-01-A # sh ip mroute 239.11.2.41
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, c - PFP-SA cache created entry,
* - determined by Assert, # - iif-starg configured on rpf intf,
e - encap-helper tunnel flag, l - LISP Decap Refcnt Contributor
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.11.2.41), 10w3d/stopped, RP 192.168.254.101, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null

(192.168.220.22, 239.11.2.41), 10w3d/00:02:16, flags: P
Incoming interface: TwentyFiveGigE1/0/14, RPF nbr 192.168.253.238
Outgoing interface list: Null

###############

also in debug(Cat 9500) we are seeing continuous msgs (2x cat 9500 connects to 2x Boarder Leafs Cisco ACI)

 014626:JAN 1 17:36:33.016 EDT: (Data-header) for 192.168.102.247, group 239.192.195.196
014627:JAN 1 17:36:33.016 EDT: PIM(0): Adding register decap tunnel (Tunnel0) as accepting interface of (192.168.102.247, 239.192.195.196)
014628:JAN 1 17:36:33.016 EDT: PIM(0): Send v2 Register-Stop to 192.168.102.1 for 192.168.102.247, group 239.192.195.196
014629:JAN 1 17:36:33.017 EDT: PIM(0): Insert (192.168.102.247,239.192.195.196) join in nbr 192.168.253.238's queue
014630:JAN 1 17:36:33.017 EDT: PIM(0): Building Join/Prune packet for nbr 192.168.253.238
014631:JAN 1 17:36:33.017 EDT: PIM(0): Adding v2 (192.168.102.247/32, 239.192.195.196), S-bit Join
014632:JAN 1 17:36:33.017 EDT: PIM(0): Send v2 join/prune to 192.168.253.238 (TwentyFiveGigE1/0/14)
014633:JAN 1 17:37:22.754 EDT: PIM(0): Received v2 Join/Prune on TwentyFiveGigE1/0/27 from 192.168.253.114, to us
014634:JAN 1 17:37:22.754 EDT: PIM(0): Join-list: (*, 239.192.195.196), RPT-bit set, WC-bit set, S-bit set
014635:JAN 1 17:37:22.754 EDT: PIM(0): Update TwentyFiveGigE1/0/27/192.168.253.114 to (*, 239.192.195.196), Forward state, by PIM *G Join
014636:JAN 1 17:37:22.754 EDT: PIM(0): Update TwentyFiveGigE1/0/27/192.168.253.114 to (192.168.102.247, 239.192.195.196), Forward state, by PIM *G Join
014637:JAN 1 17:37:23.225 EDT: PIM(0): Building Periodic (*,G) Join / (S,G,RP-bit) Prune message for 239.192.195.196
014638:JAN 1 17:37:23.225 EDT: PIM: rp our address
014639:JAN 1 17:37:31.325 EDT: PIM(0): Insert (192.168.102.247,239.192.195.196) join in nbr 192.168.253.238's queue
014640:JAN 1 17:37:31.325 EDT: PIM(0): Building Join/Prune packet for nbr 192.168.253.238
014641:JAN 1 17:37:31.325 EDT: PIM(0): Adding v2 (192.168.102.247/32, 239.192.195.196), S-bit Join
014642:JAN 1 17:37:31.325 EDT: PIM(0): Send v2 join/prune to 192.168.253.238 (TwentyFiveGigE1/0/14)
014643:JAN 1 17:37:34.976 EDT: PIM(0): Received v2 Register on TwentyFiveGigE1/0/6 from 192.168.102.1
014626:JAN 1 17:36:33.016 EDT: (Data-header) for 192.168.102.247, group 239.192.195.196

——-

****also noticed 50-70 routes for SSDP traffic multicast address 239.255.255.250: not sure this is cause issue 

4 Replies 4

marce1000
VIP Mentor VIP Mentor
VIP Mentor

 

 - Use this document for troubleshooting : https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html

 M.

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

can you post the running config of one of the 'problem' 9500s ? Do you have any sort of storm control configured ?

Other than that, if possible, try and upgrade to one of the recommended IOS versions, 17.3.5 or 17.6.4...

Thanks a lot for looking into this 

here is MCAST configuration, we don’t have any storm control policy beside default on cat9500

C9500-48Y4C(Version 17.3.4) (2x L3 Core) connected to 2x Border leaf (Cisco ACI - 4.2(7u) )

4 links L3 connected to ACI Data Center from 9500

 

 

9500-COR-SW-01-A# (C9500-48Y4C(Version 17.3.4) L3 Core))

 

ip pim bsr-candidate Loopback255 32 100

 !

ip multicast-routing

!

interface TwentyFiveGigE1/0/6

description ACI-BL-1/1

no switchport

mtu 9000

ip address 10.X.X.X 255.255.255.252

no ip redirects

no ip unreachables

no ip proxy-arp

ip pim sparse-mode

!

interface TwentyFiveGigE1/0/14

description ACI-BorderLeaf-1/1

no switchport

mtu 9000

ip address 10.X.X.X 255.255.255.252

no ip redirects

no ip unreachables

no ip proxy-arp

ip pim sparse-mode

!

 

 

Nilay Patel
Beginner
Beginner

Any one using multicast between cisco cat 9500 & cisco aci? what's version & general config idea.  - any assistance would be very much appreciated.

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