Daily Archives: March 16, 2010

Loop prevention-2: BGP/EIGRP SOO

When the CE-PE routing protocol is OSPF, we used down bit/domain tag to prevent possibility of routing loop. In BGP, when we use a backdoor link in addition to MPLS network, there are possibilities of routing loop. 1) As we … Continue reading

Posted in mpls | Leave a comment

Loop prevention: Down Bit and Domain Tag

When CE-PE protocol is OSPF, we use “down bit” and “domain tag” to prevent routing loop to occur. When CE-PE protocol is ISIS, we use “up/down” bit for loop prevention. This bit is the higher order bit in the default … Continue reading

Posted in mpls | Tagged , , , | 2 Comments