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Cisco Bug: CSCvu58065 - N93180YC-EX: Tah-usd crash trigger with FIB TCAM FULL For IPV6 Routes when :/64 500k ipv6 routes

Last Modified

Jun 15, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I5(1)

Description (partial)

Symptom:
N93180YC-EX running  7.0(3)I5(1), with FIB TCAM FULL messages in syslog

2020 Jun  9 01:41:39 switch %$ VDC-1 %$ %IPFIB-SLOT1-2-UFIB_ROUTE_CREATE: Unicast route create failed for INS unit 0, VRF: 1, c000::/8, flags:0x0, intf:0xd0003, Error: FIB TCAM FULL For IPV6 Routes(1129381968)

show forwarding internal errors`
 
IPFIB Errors:
 
1) Event:E_DEBUG, length:96, at 422407 usecs after Wed Apr 22 09:44:08 2020
    [108] ufib_tah_add_one_route_add_tlv(2552):ERROR: tah_batch_flush returned with error: 0x43510050
 
 
2) Event:E_DEBUG, length:74, at 422361 usecs after Wed Apr 22 09:44:08 2020
    [108] tahoe_fib_batch_return_hdl(2137):ERROR: L3 LPM add failed: 0x43510050

Conditions:
FIB TCAM FULL in syslog For IPV6 Routes, when :/64 500k ipv6 routes is reached in output of "sh ipv6 route summary''

and 

Switch# show hardware internal forwarding table utilization | i "Percentage utilization of IPv6 TCAM routes"
Percentage utilization of IPv6 TCAM routes : 100
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