Comments on: Cisco R/S Lab Exam Challenge – OSPF Features, Part 1 of 2 http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/ Helping you become a Cisco Certified Internetwork Expert Tue, 07 Feb 2012 02:21:38 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: IPv6Freely http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-29318 IPv6Freely Wed, 04 Mar 2009 17:20:34 +0000 http://blog.ine.com/?p=777#comment-29318 This is one of those things that I'm not sure how exactly I was supposed to even know it existed... This is one of those things that I’m not sure how exactly I was supposed to even know it existed…

]]> By: INE Instructor http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-28640 INE Instructor Tue, 03 Mar 2009 02:45:39 +0000 http://blog.ine.com/?p=777#comment-28640 THE SOLUTION IS POSTED! Great job everyone as always! http://blog.internetworkexpert.com/2009/03/02/cisco-rs-lab-exam-challenge-%E2%80%93-ospf-features-part-2-of-2/ THE SOLUTION IS POSTED!

Great job everyone as always!

http://blog.internetworkexpert.com/2009/03/02/cisco-rs-lab-exam-challenge-%E2%80%93-ospf-features-part-2-of-2/

]]> By: ravi http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27848 ravi Sun, 01 Mar 2009 00:32:12 +0000 http://blog.ine.com/?p=777#comment-27848 In most of the cases spf time is not the biggest contributor to the overall IGP convergence. Although, ispf relatively faster (time to compute may vary). We also need to consider possibility of reducing IGP routes, by either area filters, or area summarization. Convergence time = spf+route-calculation+download time. In most of the cases spf time is not the biggest contributor to the overall IGP convergence. Although, ispf relatively faster (time to compute may vary). We also need to consider possibility of reducing IGP routes, by either area filters, or area summarization.

Convergence time = spf+route-calculation+download time.

]]> By: amit chopra http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27653 amit chopra Sat, 28 Feb 2009 05:44:16 +0000 http://blog.ine.com/?p=777#comment-27653 router ospf 1 ispf From DOCCD--- "The topology tree is used to populate the routing table with routes to IP networks. When changes to a Type-1 or Type-2 link-state advertisement (LSA) occur in an area, the entire SPT is recomputed. In many cases, the entire SPT need not be recomputed because most of the tree remains unchanged. Incremental SPF allows the system to recompute only the affected part of the tree. Recomputing only a portion of the tree rather than the entire tree results in faster OSPF convergence and saves CPU resources. Note that if the change to a Type-1 or Type-2 LSA occurs in the calculating router itself, then the full SPT is performed. Incremental SPF is scheduled in the same way as the full SPF. Routers enabled with incremental SPF and routers not enabled with incremental SPF can function in the same internetwork." router ospf 1
ispf

From DOCCD—

“The topology tree is used to populate the routing table with routes to IP networks. When changes to a Type-1 or Type-2 link-state advertisement (LSA) occur in an area, the entire SPT is recomputed. In many cases, the entire SPT need not be recomputed because most of the tree remains unchanged. Incremental SPF allows the system to recompute only the affected part of the tree. Recomputing only a portion of the tree rather than the entire tree results in faster OSPF convergence and saves CPU resources. Note that if the change to a Type-1 or Type-2 LSA occurs in the calculating router itself, then the full SPT is performed.

Incremental SPF is scheduled in the same way as the full SPF. Routers enabled with incremental SPF and routers not enabled with incremental SPF can function in the same internetwork.”

]]> By: bam http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27566 bam Sat, 28 Feb 2009 01:44:42 +0000 http://blog.ine.com/?p=777#comment-27566 Seems the tags didn't work... contact the site admin. http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_incre_spf_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054075 Seems the tags didn’t work… contact the site admin.

http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_incre_spf_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054075

]]> By: bam http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27565 bam Sat, 28 Feb 2009 01:43:04 +0000 http://blog.ine.com/?p=777#comment-27565 We really should get in the habit of including the DocCD reference... <a href="http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_incre_spf_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054075" title="Benefits of OSPF Incremental SPF" rel="nofollow"> We really should get in the habit of including the DocCD reference…

]]> By: Issa http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27511 Issa Fri, 27 Feb 2009 21:12:18 +0000 http://blog.ine.com/?p=777#comment-27511 use ispf command under router ospf use ispf command under router ospf

]]> By: luisgarcia http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27507 luisgarcia Fri, 27 Feb 2009 19:28:10 +0000 http://blog.ine.com/?p=777#comment-27507 Yeah seems its the ispf. DocCD says its for changes to type 1 and 2 LSA's and saves CPU resources by recomputing only a portion of the tree. But I've only seen it on 6500's with 2 Sup cards. Its a stretch, but timers lsa arrival could reduce the SPF calculations.But that would have to be the same LSA ID number. Yeah seems its the ispf. DocCD says its for changes to type 1 and 2 LSA’s and saves CPU resources by recomputing only a portion of the tree. But I’ve only seen it on 6500′s with 2 Sup cards.

Its a stretch, but timers lsa arrival could reduce the SPF calculations.But that would have to be the same LSA ID number.

]]> By: Jeff http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27462 Jeff Fri, 27 Feb 2009 16:25:25 +0000 http://blog.ine.com/?p=777#comment-27462 For OSPF, I've only seen it in the Config Guide. For IS-IS, I've seen it in both the Config Guide as well as the command reference documentation. For OSPF, I’ve only seen it in the Config Guide. For IS-IS, I’ve seen it in both the Config Guide as well as the command reference documentation.

]]> By: noairbag http://blog.ine.com/2009/02/27/cisco-rs-lab-exam-challenge-%e2%80%93-ospf-features/#comment-27443 noairbag Fri, 27 Feb 2009 16:08:18 +0000 http://blog.ine.com/?p=777#comment-27443 I came across this once - I remember having to hunt for it and found it under IS-IS rather than OSPF. I came across this once – I remember having to hunt for it and found it under IS-IS rather than OSPF.

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