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Loopback Question
- Thread starter iolair
- Start date
In the case where a router ID has already been set (OSPF, EIGRP, BGP) and you don't want it changing when you reboot the router because you've already applied access-list rules or tunnel endpoints based on the router ID that exists.
Usually, it is poor design or lack of knowledge when the administrator lets the RID establish based on an active interface and doesn't use a loopback or router-id command.
Personally, I like loopbacks on all my L3 devices.
Usually, it is poor design or lack of knowledge when the administrator lets the RID establish based on an active interface and doesn't use a loopback or router-id command.
Personally, I like loopbacks on all my L3 devices.
No reason not to, rather many reasons to do, depending on your situation. With floating static routes, I have found it useful to NAT to the loopback interface. Once I had trouble with a router coming back up, as NAT translations were not clearing. I NATted to a loopback there too.
Sometimes you may want to manipulate DR and BDR selections in OSPF---a loopback with a higher IP address will do this (DR).
Since the interface is always up, it is also good as a management interface (easily managed this was---organize by, say router 1 =1.1.1.1/32, router 2=2.2.2.2, etc.).
My 1.5 cents...
/
tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!
Sometimes you may want to manipulate DR and BDR selections in OSPF---a loopback with a higher IP address will do this (DR).
Since the interface is always up, it is also good as a management interface (easily managed this was---organize by, say router 1 =1.1.1.1/32, router 2=2.2.2.2, etc.).
My 1.5 cents...
/
tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!
And Tad has risen from the proverbial dead to post at EXACTLY the same time as myself...
Been slaying them thar dragoons lately? That can cause your plate to be full...
/
tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!
Been slaying them thar dragoons lately? That can cause your plate to be full...
/
tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!
- Thread starter
- #6
Yup, R&S. Wasn't as prepped on some of the new V4 material so I bogged down there. I've learned if a topic is on the lab blueprint, I'd better be able to configure all aspects intimately. No time to look up in Doc CD anymore. But, the lab is very do-able and I thought it was a very fair test of skills.
Back to the racks!
Back to the racks!
Yes. I started with the V3.0 material and was very comfortable with that but scheduled my lab and paid three months out thinking I'd be able to master all the new topics for v4.0 after the revision. I didn't. But I've seen the actual exam now and it was not as scary a beast as I expected. I just need to review my approach and fully master the V4.0 topics.
I'm going through the entire course and three volume labs again with a new perspective. I did the hard bound materials and laminated lab topologies. Worth the money! I'm also living in the DocCD and really studying all the topics on the blueprint. I'm building templates for all the technologies and writing configs over and over from memory and then timing myself to get the configs done faster. If I get stumped, I review the material, find it in the docCD again then move forward. I don't want to use the question mark for anything.
I stopped groupstudy since there was so much unnecessary chatter. I'm about to stop monitoring OSL because most of the stuff isn't lab related or goes off on tangents that aren't helpful for the lab. I'm currently prepping the new CCNP courses, so that helps review some of the material but IPExpert has the most updated CCIE stuff and they are great with support.
Where are you in your studies?
I'm going through the entire course and three volume labs again with a new perspective. I did the hard bound materials and laminated lab topologies. Worth the money! I'm also living in the DocCD and really studying all the topics on the blueprint. I'm building templates for all the technologies and writing configs over and over from memory and then timing myself to get the configs done faster. If I get stumped, I review the material, find it in the docCD again then move forward. I don't want to use the question mark for anything.
I stopped groupstudy since there was so much unnecessary chatter. I'm about to stop monitoring OSL because most of the stuff isn't lab related or goes off on tangents that aren't helpful for the lab. I'm currently prepping the new CCNP courses, so that helps review some of the material but IPExpert has the most updated CCIE stuff and they are great with support.
Where are you in your studies?
I teach CCNP and the courses just revised so I am reviewing the materials and working the labs for bugs/issues the students might see. I do this for all the courses I teach whenever a revision occurs.
I'm planning another lab attempt in June/July but won't schedule until I'm fully prepped with the v4 material.
I'm planning another lab attempt in June/July but won't schedule until I'm fully prepped with the v4 material.
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