04-27-2020 06:40 PM
Nexus7K: HSRP with VPC setup,Shall we run BFD between HSRP peers?
04-27-2020 07:28 PM
BFD usually is not used with HSRP. It is used with routing protocols like BGP to lower the fail-over time. HSRP fail-over time is pretty fast but if you want to improve that, you can manipulate the HSRP timers.
HTH
04-27-2020 08:17 PM
Thanks for your reply.
Here my question is will it work along with VPC?
Because VPC and HSRP are configured in a customer environment, the customer wants to configure BFD between HSRP peers.
I read in one of the CCO document that BFD with VPC is not supported. The document link mentioned,you can find it in "SVI limitation" section.
SVI limitations:
04-27-2020 10:15 PM
Hi @booshanm
You do not need BFD between vPC peers. They are both active forwarding. Plus, you can enable "vpc peer-gateway" and the switches can route the traffic destined to it's peer as well.
Cheers,
Sergiu
04-27-2020 10:38 PM
Customer want to configure the BFD on HSRP peers, not VPC peers but VPC is also running in the same box.
04-27-2020 10:56 PM - edited 04-27-2020 10:57 PM
If the VLAN configured with HSRP is a vPC vlan, then HSRP will be active forwarding on both vPC peers, thus no need for BFD.
Cheers,
Sergiu
04-28-2020 08:59 PM
As per my understanding is correct, BFD is a control plane protocol. If this a case HSRP is active /standby on the control plane and its hold on time is 10 Sec. To minimize the hello and holdon time BFD is required, right?
04-28-2020 10:58 PM - edited 04-28-2020 10:58 PM
Hi @booshanm
Generally speaking yes, BFD can be configured for HSRP to improve convergence. However, since you mentioned about vPC, there are a couple of limitations which you need to be aware of. All the limitations are also mentioned in config guide:
BFD has the following configuration guidelines and limitations:
When Layer 3 over vPC feature is enabled using the layer3 peer-router command, BFD enabled with echo function is not supported on a switched virtual interface (SVIs) using vPC VLANs that are part of a vPC peer-link.
vPC is not supported.
I think is pretty clear from these limitations that vPC + BFD for HSRP is not something supported.
Hope it helps,
Sergiu
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