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Cisco Bug: CSCuq68024 - Nexus3500: PIM hellos generated by Loopback intf sent with no L2 header

Last Modified

May 21, 2017

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases

6.0(2)A4(1)

Description (partial)

Symptom:
Frames sent out of an Nexus3500 ethernet interface with no L2 header.

Example frame in Hex format (starting with IPv4 header):
45 c0 00 32 e4 b1 00 00 01 67 ea 58 0a 26 ff 67 
e0 00 00 0d 20 00 e4 06 00 01 00 02 00 69 00 13
00 04 00 00 00 01 00 16 00 00 00 14 00 04 03 b1
f7 95 00 00 00 00 00 00 00 00 00 00 be 49 13 05

Conditions:
Nexus3500 running 6.0(2)A releases.
AND
Switch configured with Loopback interface, with PIM enabled.

interface loopback0
  ip address <ip addr/mask>
  ip pim sparse-mode
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