CCIE-The Journey begins http://www.oftheoak.com/blog/blog5.php en-US http://blogs.law.harvard.edu/tech/rss 60 How do you turn one of these routers on again? http://www.oftheoak.com/blog/blog5.php/2009/05/16/how-do-you-turn-one-of-these-routers-on Sat, 16 May 2009 23:53:23 +0000 Uncategorized 30@http://www.oftheoak.com/blog/ <p>Ah Spring. What a beautiful time of year to lock oneself away in front of a rack full of routers for 12 hours at a stretch! <br /> If you've found your way to this dark corner of the web, you either know me and want a laugh, or you need professional help. I suggest you hit the back button and go seek a 5-cent session with Lucy van Pelt. </p> <p>Anyway....on with the geek-ese.</p> <p>I spent today knocking 3 months of rust off my BGP skills. It's really quite amazing how alien working in IOS can be after a few months off!!!Some details such as using the as-set command on an aggregate-address to remove the atomic aggregate were still present in my hollow skull. Others like regular expressions and advertise-maps were nowhere to be found. I took some notes to to remind myself of details and tricks that I'd be likely to forget and will post them under tips and tricks.</p><div class="item_footer"><p><small><a href="http://www.oftheoak.com/blog/blog5.php/2009/05/16/how-do-you-turn-one-of-these-routers-on">Original post</a> blogged on <a href="http://b2evolution.net/">b2evolution</a>.</small></p></div> Ah Spring. What a beautiful time of year to lock oneself away in front of a rack full of routers for 12 hours at a stretch!
If you've found your way to this dark corner of the web, you either know me and want a laugh, or you need professional help. I suggest you hit the back button and go seek a 5-cent session with Lucy van Pelt.

Anyway....on with the geek-ese.

I spent today knocking 3 months of rust off my BGP skills. It's really quite amazing how alien working in IOS can be after a few months off!!!Some details such as using the as-set command on an aggregate-address to remove the atomic aggregate were still present in my hollow skull. Others like regular expressions and advertise-maps were nowhere to be found. I took some notes to to remind myself of details and tricks that I'd be likely to forget and will post them under tips and tricks.

Original post blogged on b2evolution.

]]> http://www.oftheoak.com/blog/blog5.php/2009/05/16/how-do-you-turn-one-of-these-routers-on#comments BGP tips for novices and functional alcoholics http://www.oftheoak.com/blog/blog5.php/2009/05/16/bgp-tips-for-novices-and-functional-alco Sat, 16 May 2009 23:56:39 +0000 Tips & tricks 31@http://www.oftheoak.com/blog/ <p>BGP network advertisement assumes classful if mask is not specified. </p> <p>When peering to an interface other than the physical one (a loopback for example) remember to update the bgp source on the router with the loopback interface. Also don't forget to configure ebgp-multihop. The default value for ebgp-multihop is 255. You can specify a lower number if desired, but it's not required.<br /> ex R1 - BGP neighbor 200.1.1.1 remote-as 10<br /> BGP neighbor 200.1.1.1 ebgp-multihop<br /> R2 - Int lo0<br /> ip-address 200.1.1.1 255.255.255.255<br /> BGP neighbor 192.168.1.1 remote-as 20<br /> BGP neighbor 192.168.1.1 update-source lo0</p><div class="item_footer"><p><small><a href="http://www.oftheoak.com/blog/blog5.php/2009/05/16/bgp-tips-for-novices-and-functional-alco">Original post</a> blogged on <a href="http://b2evolution.net/">b2evolution</a>.</small></p></div> BGP network advertisement assumes classful if mask is not specified.

When peering to an interface other than the physical one (a loopback for example) remember to update the bgp source on the router with the loopback interface. Also don't forget to configure ebgp-multihop. The default value for ebgp-multihop is 255. You can specify a lower number if desired, but it's not required.
ex R1 - BGP neighbor 200.1.1.1 remote-as 10
BGP neighbor 200.1.1.1 ebgp-multihop
R2 - Int lo0
ip-address 200.1.1.1 255.255.255.255
BGP neighbor 192.168.1.1 remote-as 20
BGP neighbor 192.168.1.1 update-source lo0

Original post blogged on b2evolution.

]]> http://www.oftheoak.com/blog/blog5.php/2009/05/16/bgp-tips-for-novices-and-functional-alco#comments OSPF external route notes http://www.oftheoak.com/blog/blog5.php/2009/05/16/ospf-external-route-notes Sat, 16 May 2009 23:58:08 +0000 Tips & tricks 32@http://www.oftheoak.com/blog/ <p>External Type 1 - the cost of these routes reflect the entire path, not just the path between the ASBR and the destination network.<br /> External Type 2 - the cost of these routes reflects only the cost of the path from the ASBR to the final destination. This is the default type for routes learned via redistribution.</p><div class="item_footer"><p><small><a href="http://www.oftheoak.com/blog/blog5.php/2009/05/16/ospf-external-route-notes">Original post</a> blogged on <a href="http://b2evolution.net/">b2evolution</a>.</small></p></div> External Type 1 - the cost of these routes reflect the entire path, not just the path between the ASBR and the destination network.
External Type 2 - the cost of these routes reflects only the cost of the path from the ASBR to the final destination. This is the default type for routes learned via redistribution.

Original post blogged on b2evolution.

]]> http://www.oftheoak.com/blog/blog5.php/2009/05/16/ospf-external-route-notes#comments