External BGP (eBGP) Core Architecture

tobeciscotobecisco Registered Users Posts: 1 ■□□□□□□□□□
Hi all,

Can some body explain why transit routers can cause a loop if they do not run iBGP as discussed below?

"..All routers providing transit between multiple core routers in a region must also run iBGP to prevent routing loops, and they should have their iBGP sessions sourced from a loopback interface, with the loopback interface included in the regional IGP.."

Full article for "External BGP (eBGP) Core Architecture"


Thanx in advance
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