Posted by: Richard @ Configureterminal.com | January 18, 2008

Day 5 of Week 2

Tonight I am updating my blog from a laptop that has its default gateway configured as a HSRP virtual IP address.  Again, I am making use of Dynamips but on this occasion I have two routers connected to the same LAN segment as my laptop’s loopback adapter allowing me to configure, test, and debug HSRP, VRRP, and GLBP.

Here are the URL’s I have been/will be using as guides for various gateway load balancing scenarios:

Using HSRP for Fault-Tolerant IP Routing
Virtual Router Redundancy Protocol
GLBP – Gateway Load Balancing Protocol

I have had a lot of exposure to HSRP in the past so it was quite easy to make notes on and debug this protocol tonight.  The next protocol I need to focus on is VRRP and it is effectively a standardized version of HSRP with some subtle differences, it looks like configuration is mainly just a case of swapping ‘standby’ for ‘vrrp’ so I imagine VRRP will be quite similar to debug – we’ll see…..
RSCG2 only has four bullet point ‘differences to HSRP’ covering VRRP but I want to make sure I understand it and know how to configure it before I move on, and the same goes for GLBP.

Example HSRP configuration from tonight:

Router 1 =
interface FastEthernet0/0
 ip address 192.168.200.2 255.255.255.240 – Real IP
 ip nat inside
 standby 1 ip 192.168.200.1 – Virtual IP (Default gateway)
 standby 1 priority 110 – Make this the active router (110>Default 100)
 standby 1 preempt – Force to active at anytime if higher priority
 standby 1 track FastEthernet1/0 15 – If F1/0 is down lower priority to 95 (-15)
!
interface FastEthernet1/0
 ip address 192.168.100.200 255.255.255.0
 ip nat outside
!
ip route 0.0.0.0 0.0.0.0 192.168.100.254

Router 2 =
interface FastEthernet0/0
 ip address 192.168.200.3 255.255.255.240 – Real IP
 ip nat inside
 standby 1 ip 192.168.200.1 – Virtual IP
 standby 1 preempt – Force to active at anytime if higher priority
!
interface FastEthernet1/0
 ip address 192.168.100.201 255.255.255.0
 ip nat outside
!
ip route 0.0.0.0 0.0.0.0 192.168.100.254


Note to self; I really really need to learn how to master navigating around UniverCD!

It’s Chapter 6 – ‘TCP/IP Transport and Application Services’ (TCP & SNMP) on Sunday and then the real hard work starts when I will be moving on to Part 3 – ‘IP Routing’ J

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