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Cisco Bug: CSCvu57731 - N9K: DHCP Relay ACLs not programmed into TCAM after FEX fabric port-channel member comes up

Last Modified

Sep 18, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I7(3) 7.0(3)I7(8) 9.3(4)

Description (partial)

A Cisco Nexus 9500 platform switch with FEX fabric port-channel members spread across multiple line cards might fail to program DHCP Relay ACLs into TCAM if a FEX fabric port-channel member is administratively bounced before and after a module reload.

1. Nexus 9500 chassis with multiple line cards inserted
2. FEX fabric port-channel containing multiple members spread out across multiple line cards
3. One member interface of the FEX fabric port-channel is administratively shut down prior to a line card reload.
4. After the line card is reloaded, the FEX fabric port-channel member interface is administratively brought online.
5. DHCP Relay ACLs are not programmed into TCAM of the reloaded line card per the output of `show system internal access-list input entries module <x>`
6. DHCP-enabled hosts connected to FEXs attached to this module may not receive IP addresses via DHCP, as the DHCP Relay ACL in TCAM is required to punt DHCP packets to the supervisor for DHCP Relay purposes.
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