Questions tagged [bfd]

For questions about Bidirectional Forwarding Detection (BFD), where it is a network protocol used to detect faults between two forwarding engines connected by a link. It is also explained in RFC5880.

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3
votes
1answer
218 views

Use BFD on a Virtual-Template Interface

I would like to know how I can configure Bidirectional Forward Detection on a Virtual-Template interface. Tested on IOSv and IOS-XE (ISR-4451): router#configure terminal Enter configuration commands,...
1
vote
0answers
218 views

BFD down - “matches wrong session” (SRX)

We have a Juniper SRX talking to a Dell. One of the BFD sessions has a problem. The Juniper reports it as being up, the Dell reports it as being down. In the BFD trace on the Juniper, I see messages ...
2
votes
1answer
155 views

Configuring BFD for OSPFv3 between IOS-XE and JunOS

i need to implement BFD on a IGP Link with dual-Stack OSPFv3 between an IOS-XE device (ASR903) and a Juniper MX480. i'm running BFD for Dual-Stack OSPFv3 members on many links between IOS-XE and IOS-...
1
vote
1answer
2k views

capturing specific BFD packets using tcpdump

I'm troubleshooting a problem with my site-to-site VPN at one location. I've narrowed it down to the link being up, but traffic dropping due to routing problems. I'm running ospf with over ipsec ...
1
vote
2answers
2k views

BFD Echo packet

could you explain how the BFD Echo packet is forwarded between the neighbors? RouterA -------------- RouterB The echo packet's source IP is RouterA and destination IP is also RouterA. So when ...
1
vote
2answers
1k views

BFD on BGP at ASR 1k

I'm setting up BFD on BGP between ASR1k and ASR9k. On 1k #show bfd neighbors details dosn't produce any output. Seems like BFD is not running. CPU Proccess running on 1k: BFD HW EVENT, BFD IPV6 ...
2
votes
2answers
4k views

What is the difference between UDLD and BFD?

I understand is UDLD is almost BFD for layer2. Meaning in a control plane and forwarding plane separated router architecture BFD if running on the control plane can detect control plane failures but ...
1
vote
0answers
186 views

BFD support for OSPF vyatta 6.2?

Is it possible to get support for BFD for OSPF on vyatta 6.2? I cannot find any information about it on the internet. The only thing I've seen is that the support is available on Brocade Vyatta 5400 ...
7
votes
1answer
1k views

Cisco: Reliable fast BGP failover when mixing BGP NHT and BFD

When running BFD on interfaces between two directly connected iBGP and IGP neighbours, is it more stable/reliable to use BFD for fast IGP reaction times and BGP Next Hop Tracking for faster BGP ...
4
votes
2answers
7k views

Cisco: Using carrier-delay with BFD on the same interface

Will lowering the carrier-delay on an interface configuration interfere with using BFD on the same interface? If I configure carrier-delay msec 0 on an Ethernet interface the RIB is automatically ...