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MP-BGP Scan-Time

Dear ALl,

Kinldy clarify

i would like to confirm that Cisco IOS on router which is running BGP session for Le routes and MP-BGP session to exchange VPNV4 routes, is there is Seperated Scanner one for BGP and another one for MP-BGP and each of them Scan the tabel to confirm route rechability or both use the same Scanner

Cisco Employee

Re: MP-BGP Scan-Time


There is one scanner for all address families. Note that with BGP Next-HOP Tracking, the next-hop validation is now event driven.

For more information on BGP next-hop tracking, please refer to the following URL;

Hope this helps,

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

Re: MP-BGP Scan-Time


there is one Scanner process in software, but you can instruct it to scan different address-families at different frequencies. The config could be like this (not complete for a PE, just to show bgp scan-time):

router bgp 65000

bgp scan-time 20

neighbor remote-as 65000

address-family vpnv4

neighbor activate

neighbor next-hop-self

bgp scan-time 15


Hope this helps! Please rate all posts.

Regards, Martin

New Member

Re: MP-BGP Scan-Time

Hi Martin,

can u please tell me that with MPLS VPNs, which elements will be included in an MP-BGP update

exchange between the PE routers?


Re: MP-BGP Scan-Time

Dear Sir,

MP-BGP updates contain the following data:

- VPNv4 Address --> IP+RD

- BGP Community (RT, SOO)

- Labels used for VPN packets

- BGP attributes (AS,NH, ASPATH..etc)

Please rate helpful posts

Best Regards,

Mounir Mohamed