help eBGP ASN use for multiple location

Answered Question
Aug 24th, 2010

Dear Experts,

we have 4 byte ebgp ASN ( 123456)

we have four own ip pools as per given bellow (e.g)

110.231.70.0/22
30.110.252.0/22
220.220.129.0/25
220.220.132.0/24

at present all above pools are working at our HQ with same ASN (123456)

now we are start internet service at different location with same ASN (123456)

i need to use 128 ips ( 30.110.252.0/25) for 2nd location.

Should i remove of this network  pool from HQ Router and add to 2nd location router with Same ASN (123456) ??

i am confuse about that.

>>> can i use same ASN in multiple location ???

>>> can i use my own ip pools after remove from my HQ router which is use at present in BGP network and then add in my 2nd location  ( 30.110.252.0/25) ??


Please help me

Thanks in ADV,

Vaib...

I have this problem too.
0 votes
Correct Answer by Giuseppe Larosa about 6 years 3 months ago

Hello Vaibhav,

thanks for your kind remark

>> ust add   30.110.252.0/25  in BGP network at 2nd location router. with same ASN ( 123456) am i right ??

yes

Hope to help

Giuseppe

Correct Answer by Giuseppe Larosa about 6 years 3 months ago

Hello Vaibhav,

no, you don't need to remove the /22 prefix in order to be able to advertise /25 component.

Because most specific route is used first.

All you need as noted by Dinesh is to make agreements with the two providers in order to have them to accept the /25 prefix.

The /25 prefix will live only within ISP1 AS and ISP2 AS not in the big internet but this should be enough to achieve the desired effect.

Hope to help

Giuseppe

Correct Answer by vdineshkumar83 about 6 years 3 months ago

Hi Vaibav,

        If you have internet service with same provider for both HQ and other location then you can advertise just /25 from you new location without any change in HQ. It's up to provider to advertise you segment.

Regards,

V Dinesh Kumar

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Correct Answer
vdineshkumar83 Tue, 08/24/2010 - 22:17

Hi Vaibav,

        If you have internet service with same provider for both HQ and other location then you can advertise just /25 from you new location without any change in HQ. It's up to provider to advertise you segment.

Regards,

V Dinesh Kumar

csawest.dc Tue, 08/24/2010 - 23:42

Dear Dinesh,

Thanks for your support,

Attually we are Internet Service Provider , we have multiple ISP bandwidth

45 MB Reliance.

25 MB Airtel.

at present we are advertised our own ip pools in (Reliance , and Airtel )110.231.70.0/22 and, 30.110.252.0/22 ip pools in both the services provider and 220.220 ip pools provided by relinace only.

we need to 30.110.252.0/25 ip pools to 2nd location with same ASN ( 123456).

so shlould i remove from HQ router for add to 2nd location router ???

pl guide me ,

Thanks in ADV,

Correct Answer
Giuseppe Larosa Wed, 08/25/2010 - 03:45

Hello Vaibhav,

no, you don't need to remove the /22 prefix in order to be able to advertise /25 component.

Because most specific route is used first.

All you need as noted by Dinesh is to make agreements with the two providers in order to have them to accept the /25 prefix.

The /25 prefix will live only within ISP1 AS and ISP2 AS not in the big internet but this should be enough to achieve the desired effect.

Hope to help

Giuseppe

csawest.dc Wed, 08/25/2010 - 04:18

Dear Giuseppe,

Thanks gr8 help,

so you mean to say we dont need to remove all the ip pools in bgp network in my HQ router, same as it is in this HQ router.

just add   30.110.252.0/25  in BGP network at 2nd location router. with same ASN ( 123456) am i right ??

Thanks in ADV,

Correct Answer
Giuseppe Larosa Wed, 08/25/2010 - 04:24

Hello Vaibhav,

thanks for your kind remark

>> ust add   30.110.252.0/25  in BGP network at 2nd location router. with same ASN ( 123456) am i right ??

yes

Hope to help

Giuseppe

csawest.dc Wed, 08/25/2010 - 04:32

Dear Friend,

thanks for help me for ur great support , if any qury i will revert back again....

Thanks once again!!!

Vaib...

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