Cisco Bug: CSCvt93579 - Gateway not caching CNAME query-type properly
Oct 07, 2020
- Cisco ASR 5000 Series
- Cisco ASR 5500
Known Affected Releases
21.14.9 21.15.43 21.20.0 21.21.0
Symptom: We get the response for query type CNAME for the Domain Name: ecscf1-gm.so102.volte.gtm.vzims.com [XGWin]BRHOALTBPNR-L-CI-DXGW-00> dns-client query client-name PGW-DNS query-type A query-name ecscf1-gm.so102.volte.vzims.com Tuesday April 21 17:05:07 UTC 2020 Query Name: ecscf1-gm.so102.volte.vzims.com Query Type: CNAME TTL: 2 seconds Answer: Domain Name: ecscf1-gm.so102.volte.gtm.vzims.com Query Name: ecscf1-gm.so102.volte.gtm.vzims.com Query Type: A TTL: 25 seconds Answer: -Negative Reply- Failure Reason: No relevent answer for the record ty But when we checked DNS client cache the entry is not created for this Cname when we get back the response. [XGWin]BRHOALTBPNR-L-CI-DXGW-00> show dns-client cache client PGW-DNS query-name ecscf1-gm.so102.volte.vzims.com query-type A Tuesday April 21 17:05:20 UTC 2020 Conditions: When DNS-response is received with CNAME without A/AAAA rr-type response.
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