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Cisco Bug: CSCvv34688 - IPv6 communication stops working post applying ipv6 source-guard on interface (c9200 layer2)

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Catalyst 9200 Series Switches

Known Affected Releases

16.12.2 16.12.3 16.9.4 17.2.1

Description (partial)

Symptom:
IPv6 communication stops working on Cat9200 post reload when IPV6 source-guard with permit link-local is applied on switch port

]C9300-1#ping fe80::39a0:951b:41c:3284
Output Interface: vlan 36
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to FE80::39A0:951B:41C:3284, timeout is 2 seconds:
Packet sent with a source address of FE80::FAB7:E2FF:FE4D:47D5%Vlan36
.....
Success rate is 0 percent (0/5)

C9200-1#sh device-tracking database interface gi1/0/5  PC Connected  
 
    Network Layer Address               Link Layer Address Interface        vlan prlvl  age   state     Time left
ND  FE80::39A0:951B:41C:3284                a036.9fe6.cedc  Gi1/0/5          36  0005   55s  REACHABLE  256 s

Conditions:
interface GigabitEthernet1/0/5
switchport access vlan 36 
switchport mode access
device-tracking
ipv6 source-guard attach-policy IPv6_SG_policy    -->>  User defined or Default 
end

ipv6 source-guard policy IPv6_SG_policy
validate address
permit link-local
end
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