VRRP Opeations

                     Now let’s talk about an industry standard, it’s VRRP (Virtual Router Redundancy Protocol), and it has lot of similarity to HSRP.But there are few differences. Let’s take a look exactly how VRRP works in this topic.

                         You can see in this topology like HSRP, we got couple of Routers or Multilayer Switches. That are capable of forwarding traffic of our local subnet, and the Router that actually doing that job in HSRP, we called “Active Router”. And the Router that next candidate to become the Active Router, we called it the “Standby Router”. Well the terminology changes with VRRP, with VRRP instead of calling Router or multilayer switch, The Active Router, we call it “Master Router”.

And instead of having a Standby Router, we have a “Backup Router”.

                    What in generally the mission of both of these protocols is the same, if we have a failure for example on SW2, we lost our Master Router.

                           Then SW3 could transition from a Backup role to a master Role, and traffic could be forwarded via SW3.

                             One other difference if we wanted to in generally, it’s possible with VRRP to have the Virtual Router’s IP Address which in this case is 10.1.1.1

                         We can have that Virtual Router IP Address (VVIP Address) of a Physical interface on SW2 for example, in this case SW2 has an IP Address of 10.1.1.2 on fast Ethernet0/3, but it actually could have an ip address 10.1.1.1

                               But generally that not considered to be best Practice. Generally we do just like we did with HSRP, we give that Virtual Router an IP Address that’s not assigned to Physical interface one of our router.

                            Another difference between these Protocols is with HSRP by default, we sent a Hello message in every 3 Seconds. Well VRRP, we send an “Advertisement” every 1 second.

                                        Another difference is way tracking works. Remember with HSRP, we can do “Interface Tracking” on our Router or Multilayer Switch. And if interface went down, we can say “I want to decrement the HSRP Priority by a certain number. HSRP have another option called “Object Tracking”. Well with VRRP, we don’t technically have interface tracking feature, However on of the objects that we can track is a “interface State”

   Ø  HSRP Created by Cisco, for Cisco in 1994

   Ø  VRRP Created by IETF in 1999.Works between multiple Vendors.

   Ø  GLBP Created by Cisco, for Cisco in 2005

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