HSRP/VRRP/GLBP cheat sheet
By stretch | Monday, September 15, 2008 at 3:22 a.m. UTC
Monday's here and I feel like I'm ready to get back on track. What better way to start off the week than with a new cheat sheet? This one is on HSRP, VRRP, and GLBP, which are collectively classified as first hop redundancy protocols.
It is somewhat irritating that we have three protocols which accomplish nearly the same tasks. HSRP and VRRP are practically identical, while GLBP expands their functionality to offer load balancing. Interestingly, VRRP does not support IPv6, as IPv6 can provide more robust router discovery through its Neighbor Discovery Protocol. Cisco has included IPv6 support in HSRP and GLBP, though.
About the Author
Jeremy Stretch is a network engineer living in the Raleigh-Durham, North Carolina area. He is known for his blog and cheat sheets here at Packet Life. You can reach him by email or follow him on Twitter.
Posted in Announcements
September 15, 2008 at 4:28 a.m. UTC
It came two days too late, I just passed my CCNP switching test on Friday! But thanks, it looks like a good addition to the already wonderful library.
September 15, 2008 at 7:16 a.m. UTC
Great new cheat sheet, it may be worth noting that Cisco recommend that the preempt value should be the time +50% it takes for participating router to boot up into an forwarding state.
I was reading the Campus SRND last night because I was bored!!!
September 16, 2008 at 9:06 a.m. UTC
Is Neighbor Discovery Protocol a viable solution for first-hop redundancy?
September 16, 2008 at 2:29 p.m. UTC
September 16, 2008 at 4:23 p.m. UTC
Thanks Jeramy :)
September 17, 2008 at 12:43 a.m. UTC
I would also like more information on IPv6 NDP as a first-hop redundancy protocol. I would assume this would only work for auto-config clients and not DHCPv6 or static assigned devices? This would also depend on the client's stack for failover and detection, is this even viable? BTW, I really enjoy your site. Thanks,
November 18, 2008 at 1:04 p.m. UTC
Using multigroup with HSRP, it is possible define a simple load-balancing... more info on http://www.ciscozine.com/2008/11/01/how-to-optimize-hsrp/
January 4, 2010 at 1:08 p.m. UTC
Hi, HSRP is Cisco proprietary, not RFC. Aside from that, you're doing a great job!
January 4, 2010 at 9:08 p.m. UTC
Sorry Stretch, that's what I read on the Cisco Press Exam Guide :(