Multihome BGP question

[zhiling li]

Hello, everyone:

Would you please look at my BGP design and tell me if there is any defect? I am going to deploy it this weekend.

If I receive full route instead of default+partial routes from both ISP, can the routers handle it? I have no policy for ibgp, so they will exchange full bgp table.

CE-A: 2G RAM, cisco7606-S

CE-B: 1GRAM, cisco7606

CE-C: 1G RAM, Cisco6506-E

Really really appreciate your time and suggestion.

Thanks a lot!!!!

[Edison Ortiz · Accepted solution]

You need Sup720-3BXL or Sup720-3CXL on the 6500 for full internet routing support

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet09186a0080159856.html

Table 1.

You need RSP720-3CXL or RSP720-3CXL-10G in the 7600s

http://www.cisco.com/en/US/prod/collateral/routers/ps368/product_data_sheet0900aecd8057f3b6.html

Table 3

http://www.cisco.com/en/US/prod/collateral/routers/ps368/product_data_sheet0900aecd8072579f.html

Table 4

[zhiling li]

I checked and we have proper hardware. Here is my question:

If one full BGP table requests 512M RAM and if the router has 3 bgp session(either ebgp or ibgp) to exchange ful BGP table, will the route need 3X512M RAM in order to handle 3 bgp sessions?

Anyone can check if the policy looks fine or not?

Highly appreciate your suggetions!

[Edison Ortiz]

You are using hardware assisted platforms and routes are not stored in RAM, they are stored in ASICs.

The tables I provided will give you the limitations for each one of them.

The number should be used against the numbers of routes installed in RIB, not the number of BGP prefixes.

For instance, you can have 3 BGP prefixes in the BGP table but only one is installed in the RIB.

Regards,

Edison