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Dual AS in Cisco router

I am trying to buy Cisco router ISR4451-X-SEC/K9 with below specification. My question is can this router be configure for dual autonomous system (AS) in (BGP)? So, if one IP range blocked for some reason the second one will be available and the service not interrupted. If yes, is there any guide to do that?

ISR4451-X-SEC/K9 Cisco ISR 4451 Sec Bundle, w/SEC license
CON-SNT-ISX451-X      SNTC-8X5XNBD Cisco ISR 4451 Sec b
SL-44-IPB-K9        IP Base License for Cisco ISR 4400 Series
MEM-4400-DP-2G 2G DRAM (1 DIMM) for Cisco ISR 4400 Data Plane
SL-44-SEC-K9        Security License for Cisco ISR 4400 Series
MEM-44-4G        4G DRAM (1 x 4G) for Cisco ISR 4400
SISR4400UK9-166 Cisco ISR 4400 Series IOS XE Universal

Thanks

atlas_shuddered

In order to drop more than one BGP domain onto the router you would have to utilize VRF and then either route leak between the two instances or connect an IGP one hop back from the BGP instances to handle load balancing/resilience.

Nathan Hawkins

Here's Cisco's actual documentation on what you are asking about:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-support-for-dual-as-configuration-for-network-as-migrations.html

atlas_shuddered

The above documentation is used for migrating between AS's. You could do this short term but long term, things break.

Math Tec

ASKER

@ atlas_shuddered. Thank you so much. Can you please share any documentation about that?

Nathan Hawkins

How exactly do things break? This seems like what hes asking for and I believe this would work long term.

ASKER CERTIFIED SOLUTION

atlas_shuddered

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