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Does 3750 support new ASN format ?

g.peart
Level 1
Level 1

Hi All,

I have a 3750 running 12.2(55) and  when I configure BGP I only get the standard

AS number choice of 1-65535, but my provider is supplying a 4-byte AS number

which is six digits and it gets rejected at the prompt on the 3750.

Does that mean no support on 3750

TIA

1 Reply 1

Peter Paluch
Cisco Employee
Cisco Employee

Hello,

The 3750 indeed does not support 4B ASNs. The lowest Catalyst platform supporting 4B ASNs is 4500E. Your provider has to assign you a 2B number. If you are not using multiple providers and provider independent IP space, you do not need a public AS number anyway, and you should be fine with running a private ASN (in the range 64512 - 65535). This has to be decided by your ISP, however.

Best regards,

Peter

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