Comparing HSRP and GLBP
FHRP (First Hop Redundancy Protocol) is a category of protocols that provide seamless, fault tolerant default gateways for hosts and includes HSRP, VRRP, and GLBP. HSRP and VRRP work similarly, with...
View ArticleQuickening EIGRP Convergence
Awhile ago, I wrote a bit on why EIGRP is so quick to converge. I would like to point out a few other things we can do as network engineers to keep EIGRP converging quickly even in a large,...
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Verifying OSPF Adjacencies
When enabled, the first thing that an OSPF routing protocol router does is look to create a formal neighbor relationship with its directly connected OSPF peers. This adjacency is created by exchanging...
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Tip to Configuring Etherchannel
Has configuring Etherchannel ever frustrated you? Have you ever thought you had everything configured properly, but yet, the bundle will not form? Many of my students and I have. For those of you who...
View ArticleUseful Cisco IOS Commands
Have you ever come across a Cisco IOS command that made you say to yourself “I wish I had known about this command years ago!” ? And then once you found it, you wondered how you ever could have...
View ArticleMulti-Vendor EIGRP
EIGRP (Enhanced Interior Routing Protocol) has been a popular, highly-praised routing protocol developed for Cisco routers since 1993. Cisco designed EIGRP for use on its own platform and it included...
View ArticleHow Do You Troubleshoot?
There’s no one correct way to troubleshoot. It’s not an exact science. Having worked with your colleagues to address a networking issue, you probably have found that each engineer has his/her way of...
View ArticleUnderstanding OSPF Routes
So your organization is running the OSPF routing protocol. Your access to the Cisco router has been limited to a few “show” commands and you’re wondering how to decipher some of those OSPF routes you...
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Tricks of the Trade – Unity Connection and that Pesky Session Timeout
So I walked into the office early one morning to find my colleague and close friend exasperated, frustrated and some other kind of angry –ated word saved specifically for times when two words simply...
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Cisco Prime Infrastructure v2.0
Cisco Prime Infrastructure version 2.0 is finally here. For those of you who have not heard, Cisco Prime Infrastructure 2.0 provides a single integrated solution for comprehensive wired and wireless...
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