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Multicast packets drop on enabling diffserv examination, with hardware BFD assist.

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TitleMulticast packets drop on enabling diffserv examination, with hardware BFD assist.
Symptoms

Multicast packets are dropped in Hardware.
Sample configuration below:


Sample  Network Topology:

SW1(1)---------(1)SW2


Sample Configuration Files:



sw1:

cr vlan v1
conf vlan v1 add port 1
conf vlan v1 ipa 10.1.1.1/24
en ipf
conf ospf add vlan v1 area 0.0.0.0
en ospf

sw2:

cr vlan v1
conf vlan v1 add port 1
conf vlan v1 ipa 10.1.1.1/24
en ipf
conf ospf add vlan v1 area 0.0.0.0
en ospf
configure bfd hardware-assist primary loopback-port 18



on Sw2

enable diffserv examination ports all
load script fails on sw1 and it is observed that the OSPF neighborship fails as multicast (hello) packets are dropped.


* X460G2-48x-10G4.20 # en diffserv examination ports all
Warning: Enabling diffserv examination will cause dot1p replacement of 802.1q tagged packets.

 
Environment
  • Summit X460-G2
  • EXOS 21.1.1.4
Cause
On enabling diffserv examination ports all with the BFD assist feature it is observed that the OSPF neighborship fails as multicast hello packets are dropped and causing OSPF and MPLS adjacency to drop.
Resolution
The above reported issue is fixed in EXOS 22.2.1 and back ported to EXOS 21.1.3 as well as per CR#xos0065326 filed by Engineering analysis. For more information you can refer to  the same or call GTAC.
Additional notes

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