Change of advertising for the BGP subnet

Probably a simple question, but my skills BGP are almost nothing... apologies in advance.

Scenario:

CompanyABC has a 22 1.1.0.0 subnet.  The 22 full announced out of CorpOffice1 to isps1.  There is a roadmap set up that uses a prefix list to announce the outgoing subnets.  Below is an example config:

BGP:

router bgp 35555

changes of the next newspaper

Remote 2.2.2.2 a neighbor - like 5555

2.2.2.2 neighbor activate

neighbor 2.2.2.2 soft-reconfiguration inbound
2.2.2.2 a neighbor ISP1_5555_out map out route

Map of the route:

ISP1_5555_out allowed 10 route map
match ip address prefix-list ISP1_Primary

List of prefixes:

IP-list of prefixes ISP1_Primary seq 10 permit 1.1.0.0/22

Lets say that CompanyABC also has another office which is also served by isps1.  They want to divide the 22 subnet so that the first 3 subnets (1.1.0.0,1.1.1.0 and 1.1.2.0) are always announced to CorpOffice1, but they want to configure BGP with isps1 to CorpOffice2 and announce only the 1.1.3.0 subnet from there.

Questions:

The configuration change is not as simple as changing the prefix-list to the CorpOffice1 to announce the 3 24 subnets and configure a BGP configuration similar to CorpOffice2, but only the 1 24 subnet advertising?

Changing the configuration to CorpOffice1 would require coordination with isps1 to make this change?

(Should of course coordinate with isps1 configure BGP CorpOffice2 to announce the second subnet.)

What is time of reconfiguration CorpOffice1 stop/impact?

Thanks in advance, guys.

Yes you can do as you said. You can use following the procedure-

-Come three/24 prefixes of CorpOffice1.

-Change the prefix-list out route-map to allow three 24 prefixes.

-Ask the ISP to accept these prefixes. ISP must have applied inbound route-map to have control on the prefixes that you are advertising. It may be in a format like "prefix ip allowed list of 24 1.1.0.0/22" or may be just allowed 22 prefix. Therefore, confirmation with the ISP and this route-map change may be required.

-Once the ISP confirms that they are open/24 prefixes and advertising to the internet, you can stop advertising 22 prefix. Confirm if 24 prefixes are announced to internet or not, you can connect to any global server and look for your bgp route prefixes.

-Also, as soon as you stop the advertising/22 prefix, check if you are able to reach internet or not. If this is not the case, take a source based traceroute results and then start advertising again 22 prefix and troubleshoot it ISP below.

-Note pls useful messages-

Kind regards

Assani

Tags: Cisco Network

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