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Cisco Bug: CSCvs70206 - CUBE DNS cache clear should be limited only to the matched connection id

Last Modified

Aug 29, 2020

Products (53)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9300-48P-A Switch
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Known Affected Releases

16.12.3 16.9.4 17.3.1

Description (partial)

Whenever there is a TCP transport failure notification on a SIP Trunk with Registration enabled, CUBE will reset the DNS cache and trigger a fresh DNS lookup and registration to ensure CUBE is registered with the right registrar server. 

If CUBE is used as a multi-tenant with multiple TCP/TLS connections and receives a TCP reset notification, it will cause a reset to the DNS cache for all connections including SIP Trunks that didn’t have any TCP/TLS failures, causing calls to fail as the DNS Cache is cleared and won’t get refreshed until a new registration takes place. 

The following errors are observed in the CUBE:

059279: *Jan 16 03:17:30.773: //-1/xxxxxxxxxxxx/SIP/Transport/sipTransportPostRemoteClosure: Notifying SIP GW Register of TCP remote closure for addr=, port=5060, local_addr=, local_port=24972, connid=60
059294: *Jan 16 03:17:30.773: //-1/xxxxxxxxxxxx/SIP/Info/verbose/4096/ccsip_spi_register_free_rcb: Freeing rcb [0x7F08F7A58AA8]
059295: *Jan 16 03:17:30.773: //-1/xxxxxxxxxxxx/SIP/Info/notify/262144/ccsip_register_reset_dns_cache: CCSIP_REGISTER:: registrar 0 DNS resolved addr reset
059296: *Jan 16 03:17:30.773: //-1/xxxxxxxxxxxx/SIP/Info/verbose/262144/ccsip_register_tenant_trigger_registrations: Tenant - 207, connId - 60

059923: *Jan 16 03:17:56.798: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
INVITE sip:1111@ SIP/2.0
060654: *Jan 16 03:17:56.815: //-1/A05CA9E08511/DPM/dpMatchPeersCore:
   Outbound Destination DPG Group Request; Destination DPG=207
060760: *Jan 16 03:17:56.818: //4134/A05CA9E08511/SIP/Info/verbose/4096/sipSPIGetCachedRegistrarAddress: CUBE not registered with registrar.

CUBE Multi-tenant
SIP TCP/TLS with DNS Configuration towards the registrar server. 
TCP connection failures will trigger the issue.
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