How the BGP AS number is traceroute interpeated

[csco10851021]

I have following senario.

R1(AS2914)--------------R2(AS5689)------------R3(AS5689)----------R4(AS5689)----------R5(AS5689)

R2, R3 and R4 are in same BGP AS.R3 is RR.

If i do the trace from R2 to R4 loopback,Why is the AS number 2914 is shown ?...i think it should show AS 5689.

R2#traceroute 192.168.161.7

Type escape sequence to abort.
Tracing the route to 192.168.161.7

  1 172.20.0.53 [AS 2914] [MPLS: Label 359 Exp 0] 20 msec
  2 172.20.0.5 [AS 2914] [MPLS: Label 20 Exp 0] 0 msec
  3 172.16.21.46 [AS 2914] 28 msec *  36 msec

/Ganpat

[Reza Sharifi]

See your other post

[csco10851021]

Hi Reza,

If i do the trace from R2 to R4 loopback,Why is the AS number 2914 is shown ?...i think it should show AS 5689.

Which post you are refering to?

/Ganpat

[milan.kulik]

Hi,

can you run

sh ip bgp  172.20.0.53

sh ip bgp  172.20.0.5

sh ip bgp  172.16.21.46

on your router R2?

I believe the best BGP path will be showing a prefix coming from AS 2914  for those addresses.

HTH,

Milan