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CISCO router as DNS server - TXT and CNAME

I want to use C3900 (Ios 15.3(1)T) as DNS server.

I found it can serve SOA, NS, A, MX records. It generetes PTR records automatically too. But we have some CNAME records and TXT ones.

I can't find any way to emulate it. Maybe, somebody knows?

1. general config

ip dns server

ip domain-lookup

ip name-server 8.8.8.8

2. SOA

ip dns primary bsu.by soa ns.bsu.by dvorc@bsu.by 86400 3600 1209600 86400

3. NS

ip host bsu.by ns ns.bsu.by

4. A

ip host ns.bsu.by 217.21.43.2

5. CNAME

? #have to be: xxx.bsu.by CNAME xxx.gov.by

6. MX

ip host bsu.by mx 10 xwall.bsu.by

7. TXT

? # have to be TXT "spf -v bsu.by"

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