This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

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Monday, October 18, 2010

Question 145

What is the difference in output when using "show ip bgp" using AS-SET vs no AS-SET?

2 comments:

networkdongle said...

good one always forget "little" options like this esp with bgp, so many knobs that can be turned...

used the diagram and labbed it up from this cisco doc...

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094826.shtml

no AS-SET:
RouterD#sh ip bgp
BGP table version is 2, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 160.0.0.0/8 4.4.4.1 0 0 300 i


AS-SET:
RouterC(config-router)#aggregate-address 160.0.0.0 255.0.0.0 summary-only as-set

RouterD#sh ip bgp
BGP table version is 3, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 160.0.0.0/8 4.4.4.1 0 0 300 {200,100} i

Packets Analyzed said...

Great comment and excellent link.

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