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Cisco Bug: CSCvt07928 - IIH with TLV 229 triggering MT-2 (IPv6) and isis_init_topo_adj logs

Last Modified

Jul 20, 2020

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(16)

Description (partial)

Symptom:
Nexus box will trigger isis_init_topo_adj after receiving IIH with TLV# 229 but no further MT (Multi-Topology) in it:

--
`show isis internal event-history adjacency`
2020 Jan 31 12:28:56.145644 isis <vrf> [7194]: : isis_init_topo_adj LAN adj 2 <neighbor> over Ethernet4/12 - LAN MT-2

`show isis internal event-history iih`
2020 Jan 31 12:28:56.145635 isis <vrf> [7194]: [7227]: Processing IIH MT-0: topo_adj <circuit_id>(0xa56532c), LAN, topo_adj_level 2 IIB level-2, adj-state: UP
2020 Jan 31 12:28:56.145627 isis <vrf> [7194]: [7227]: Process restart tlv for adjacency <neighbor> over Ethernet4/12 address 10.168.210.9
2020 Jan 31 12:28:56.145581 isis <vrf> [7194]: [7227]: Fail to find IPv6 address TLV mt 0
2020 Jan 31 12:28:56.145545 isis <vrf> [7194]: [7227]: Receive L2 LAN IIH over Ethernet4/12 from <neighbor> (a8ca.7b80.5d87) len 1497 prio 7

Conditions:
Have a neighbor sending IIH with TLV# 229 but no further MT (Multi-Topology) in it other than the default one (IPv4).
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