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Replies

Dual MPLS during converstion

Jason Young
Level 1
Level 1

We are in the process of switching MPLS providers and I am looking for some advice on configuration at our head end.  We need the head end router to run both MPLS networks at the same time and then we will switch our remote offices one at a time.

Here is my current BGP and EIGRP setup:

router eigrp 99

redistribute bgp 65000

network 10.0.0.0

default-metric 100000 200 255 1 1500

auto-summary

!

router bgp 65000

no synchronization

bgp log-neighbor-changes

bgp redistribute-internal

network 10.0.0.0

redistribute eigrp 99

neighbor 64.x.x.13 remote-as 15270

neighbor 64.x.x.13 version 4

neighbor 64.x.x.13 default-originate

no auto-summary

!

Can I just add another router bgp and redistribute in my eigrp?  Example:

router eigrp 99

redistribute bgp 65000

redistribute bgp 65001

network 10.0.0.0

default-metric 100000 200 255 1 1500

auto-summary

!

router bgp 65000

no synchronization

bgp log-neighbor-changes

bgp redistribute-internal

network 10.0.0.0

redistribute eigrp 99

neighbor 64.x.x.13 remote-as 15270

neighbor 64.x.x.13 version 4

neighbor 64.x.x.13 default-originate

no auto-summary

!

router bgp 65001

no synchronization

bgp log-neighbor-changes

bgp redistribute-internal

network 10.0.0.0

redistribute eigrp 99

neighbor 12.x.x.65 remote-as 15270

neighbor 12.x.x.65 version 4

neighbor 12.x.x.65 default-originate

no auto-summary

!

Would this work or am I missing something.

Thanks for the help.

Jason

3 Replies 3

Harold Ritter
Cisco Employee
Cisco Employee

Hi Jason,

It is only possible to run one BGP process per router. If you need to connect to a second MPLS cloud using a different autonomous system number, you will need to use the "neighbor x.x.x.x local-as" command. Please refer to the following document for more information about the local-as feature:

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800949cd.shtml

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

Thanks for the info Harold.  I had another thought.  If I can use the same AS for both MPLS netowrks can I just add a neigheibor to my bgp?

Example:

router bgp 65000

no synchronization

bgp log-neighbor-changes

bgp redistribute-internal

network 10.0.0.0

redistribute eigrp 99

neighbor 64.x.x.13 remote-as 15270

neighbor 64.x.x.13 version 4

neighbor 64.x.x.13 default-originate

neighbor 12.x.x.60 remote-as 12345

neighbor 12.x.x.60 version 4

neighbor 12.x.x.60 default-originate

no auto-summary

!

Thanks,

Jason

That is correct. It would definitely be easier. But often time, the restriction on the ASN comes from the service provider themselves. If you can work with your servie provider to allow you to use the same ASN, it sound like a good idea.

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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