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Cisco Bug: CSCvr98425 - Cisco Nexus 3500 BGP-3-ASSERT syslog in IPv4 Multicast AF with Ext. Communities

Last Modified

Oct 06, 2020

Products (62)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 3548-XL Switch
  • Cisco Nexus 9396TX Switch
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Known Affected Releases

6.0(2)A8(11a) 7.0(3)I7(6) 9.3(1)

Description (partial)

Symptom:
A Cisco Nexus 3500 platform switch configured as a BGP speaker that receives a prefix in the IPv4 multicast address-family with an Extended Communities attribute might produce a "BGP-3-ASSERT" syslog. The specific syslog varies depending upon the NX-OS software release that the device is running. A Cisco Nexus 3500 platform switch running 6.x code might see the following syslog:

3548# show logging logfile | include ignore-case assert<snip>2019 Nov  6 17:33:11 3548 %BGP-3-ASSERT:  bgp-49657 [4530]  ../routing-sw/routing/bgp/bgp_import.c:1781: Assertion `0' failed.2019 Nov  6 17:33:11 3548 %BGP-3-ASSERT:  bgp-49657 [4530]  -Traceback: 0x81b5b63 0x820a9b0 0x820b53b 0x8135d8b 0x8137452 0x8137d58 librsw.so+0xa2107 libpthread.so.0+0x6140 libc.so.6+0xcedee

A Cisco Nexus 3500 platform switch running 7.x code might see the following syslog:
3548# show logging logfile | include ignore-case assert
<snip>
2019 Nov  6 16:20:49 3548 %BGP-3-ASSERT:  bgp- [29626]  ../routing-sw/routing/bgp/bgp_import.c:3756: Assertion `0' failed.2019 Nov  6 16:20:49 3548 %BGP-3-ASSERT:  bgp- [29626]  -Traceback: bgp=0x10001000 0x10278973 0x103e8380 0x103e8767 0x103e9091 0x10181553 0x10187621 0x1018d125 librsw_kstack.so=0xf3ecf000 librsw_kstack.so+0xac5cd libpthread.so.0=0xf3634000 libpthread.so.0+0x69ab libc.so.6=0xf34a4000 libc.s*

A Cisco Nexus 3500 platform switch running 9.x code might see the following syslog:
2019 Nov  6 17:01:39 3548 %BGP-3-ASSERT:  bgp- [667]  ../routing-sw/routing/bgp/bgp_import.c:4424: Assertion `0' failed.2019 Nov  6 17:01:39 3548 %BGP-3-ASSERT:  bgp- [667]  -Traceback: bgp=0x100dd000 0x103082ba 0x1044cacb 0x1044ce13 0x1044d47a 0x10238207 0x1023d529 0x1024234b librsw_kstack.so=0xf64d2000 librsw_kstack.so+0x9fb07 libpthread.so.0=0xf62b5000 libpthread.so.0+0x62be libc.so.6=0xf5910000 libc.s*

This symptom is observed regardless of whether the device is configured to perform inter-VRF leaking or not. No impact is observed to the device's ability to forward traffic, and the relevant prefix is installed in the BGP table in the VRF where it is received without issue.

Conditions:
+++ Nexus 3500 device configured to accept the IPv4 multicast address-family
+++ Nexus device receives a prefix from another BGP speaker that contains an Extended Communities attribute
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Bug Details Include

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