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Community Member

BGP Prepend

Just a quick question, if i have a community string from an ISP that will prepend my route, if i set that community 3 times will it prepend it 3 times?

for example

xx:2200 prepend to peers (ISP XX )

if i set community on 1.1.1.0/24 xx:2200, xx:2200, xx:2200 would most ISPs prepend it 3 times?

Thank you,

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: BGP Prepend

Tomasz,

You can't set the same community more than once for given prefix. On the other hand, the ISP usually provides different communities to prepend the aspath a different number of time.

For instance:

xxx:2201 = prepend once, xxx:2202 = prepend twice and so on.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
1 REPLY
Cisco Employee

Re: BGP Prepend

Tomasz,

You can't set the same community more than once for given prefix. On the other hand, the ISP usually provides different communities to prepend the aspath a different number of time.

For instance:

xxx:2201 = prepend once, xxx:2202 = prepend twice and so on.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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