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Cisco Bug: CSCvh70725 - SGT binding removed after IPv6 entry goes to STALE in IPDT Database

Last Modified

Aug 09, 2019

Products (1)

  • Cisco Catalyst 9400 Series Switches

Known Affected Releases

16.6.2

Description (partial)

Symptom:
SGT is deleted from 'show cts role-based sgt-map all' after the IPv6 entry on 'show device-tracking database' goes to STALE or is deleted from the IPDT database.

'debug rbm bindings' shows the deletion as follow:

Jan 22 06:51:24.904: %RBM: Received IP = 10.0.0.1/32 SGT = 18
Jan 22 06:51:24.904: %RBM: Deleting IP 10.0.0.1/32 SGT 18 mac cc00.9100.fce4  vlan 18 tableid 0x0
Jan 22 06:51:24.904: %RBM: Deleting IP 10.0.0.1/32 SGT 18 mac cc00.9100.fce4  vlan 18 tableid 0x0
Jan 22 06:51:24.904: %RBM: Number of entries to delete from v6-list = 1
Jan 22 06:51:24.904: %RBM: Received IP = FE80::CE99:91FF:Ff4E:FCE4/128 SGT = 18 
Jan 22 06:51:24.904: %RBM: Deleting IP FE80::CE99:91FF:Ff4E:FCE4/128 SGT 18 mac cc00.9100.fce4  vlan 18 tableid 0x0
Jan 22 06:51:24.904: %RBM: Deleting IP FE80::CE99:91FF:Ff4E:FCE4/128 SGT 18 mac cc00.9100.fce4  vlan 18 tableid 0x0
Jan 22 06:51:24.904: %RBM: Notify delete 10.0.0.1 /32 [SGT 18: SGT_Data LOCAL] prefixes 86
Jan 22 06:51:24.904: %RBM: Could not read SXP binding source data of prefix 10.0.0.1/32 (data 0x7FF96788B7C4 size 4)
Jan 22 06:51:24.904: %RBM: Binding delete prefix 10.0.0.1/32 tableid 0x0 src 1 sgt 18 f/l 0 dst 1 sgt 18 f/l 0 hdl 0xFD00073FJan 22 06:51:24.904: %RBM: +fib_ctx_ip_prefix_to_sgt_binding_update IP 10.0.0.1/32 sgt 18 dgt 18 S D updhdl 0x6D0001BCJan 22 06:51:24.905: %RBM: -fib_ctx_ip_prefix_to_sgt_delete IP 10.0.0.1/32 sgt 18 S D [Deleted]

Conditions:
Cisco IOS-XE Polaris.
CTS configured.
Dynamic SGT Tagging.
IPDT enable and gleaning from Neighbor Discovery (NDP) and DHCP6
IPv4 and IPv6 entries can be observed for the same device in IPDT database.
After the IPv6 entry goes to STALE, the SGT Binding gets removed.
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