 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
Fast failure detection is a high priority feature for any network element. Some media, like Ethernet, do not provide remote end failure. Networks must often rely on internal gateway protocol (IGP) hello messages to detect any failure and, in some cases (for example, static routes), even these hello messages are not used.
IGP hellos have their own limitations—it often takes one second or more to detect a remote end failure and processing IGP hello messages takes precious processing time. BFD overcomes IGP detection time and processing limitations in detecting any data path failures.
When configured for protocols like OSPF and IS-IS, BFD employs rapid, periodic, and inexpensive hello messages to detect path activity. You can also configure BFD to function with static routes, combining with the BFD poll bit to detect path activity.
When configured for various protocols like OSPF and IS-IS, BFD employs rapid, periodic and inexpensive hello messages to detect path activity. You can also configure BFD to function with static routes, combining with the BFD poll bit to detect path activity.
You can also configure a BFD session with a BGP neighbor or peer group to determine relatively quickly whether the neighbor or peer group is reachable. For information about configuring BFD for EBGP routes, see Configuring BGP Routing in JUNOSe BGP and MPLS Configuration Guide.
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |