04-09-2012 09:23 AM - edited 03-04-2019 03:57 PM
Hi Experts
my company now needs to deploy ISP in 2 different region , region 1 and region 2 now two big ISPs will give us connections in each region
currently we obtain an AS number with with 4 class C Subnet from ripe.i need to advertise two of this subnet to ISPs in region 1 while the remaining two Subnet towards isps (ISPs provider are the same) in region 2 ,please note the same ISP provider also exist in region 1 ang region2 as well,
the above are the input , pls tell me the best design and the best setup to for succefull implemantion please see topology attached
i wondering, do i need any kind of ibgp between regions
thanks
jamil
04-09-2012 04:59 PM
Hi Jamil,
do you have any sort of backdoor link/connection between the regions not over the ISP ?
generally speaking you can achieve this by doing the below:
1- confirm with both ISPs about the range that you going to advertise from each region/link to make sure it will be allowed from there end
2- advertise the desired IP range from the relevant region router
3- if you want to have active/standby inbound traffic per region for both range in each region use AS path prepending
4- if you want load sharing you might use BGP policies to make one link active for one range and the other standby per region
5- use iBGP internally between the CE routers ( your side )
6- not sure what is in the LAN side as it need to be aligned with your routing polices for in and out
note:
you mentioned you will obtain AS number is that mean same as number for all CEs ?
see the below link for some config examples might help you
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
hope this help
if helpful rate
04-10-2012 08:57 AM
Hi Reza
Answer to ur questions:
1)do you have any sort of backdoor link/connection between the regions not over the ISP ?
i have 2 E1 s link between the 2 regions, i going to use it for ibgp?what ur recomendations?
note:
you mentioned you will obtain AS number is that mean same as number for all CEs ?
we already got as from ripe along with 4 class c subnets
in term of BGP Multihoming what is the need of the Backdoor link betwwen region?
have y done such this setup?ps share ur gotchas
thanks
04-24-2012 09:36 AM
Hi Reza
do i need IBGP Sessions between regions?
do i need any type of RR between Regions?
i want all links in each region passes traffic,since i pay for both , i dont want any link as standby
thanks
Jamil
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