This page was exported from Free Cisco Training & Resources - Certification Exam Preparation [ https://www.ciscobibles.com ] Export date:Tue Mar 4 19:15:54 2025 / +0000 GMT ___________________________________________________ Title: R&S Quick Notes – IGP’s --------------------------------------------------- RIP Know your filters: Offset-list, Distribute-lists, distance command. With filters read carefully: “between 25 & 45″ or “from 25 to 45″. Know your prefix-lists or alternatively using ACL's instead. “passive interface” command, ONLY stops the sending of updates out the interface. Interface will still receive and process those updates. Passive interfaces will still be advertised in other updates. EIGRP Advertising a default route out one interface: “ip summary-address eigrp [AD] 0.0.0.0 0.0.0.0″ To see if a neighbor is configured as STUB, “show ip eigrp neighbors [detail]” as look for ‘CONNECTED SUMMARY' On frame-relay multipoint interfaces, don't forget to disable split-horizon. External EIGRP routes AD (admin distance = 170) can NOT be changed on per prefix basis. Metric weight values: 1 0 1 0 0 = Default 0 0 1 0 0 = Only DLY 1 0 0 0 0 = Only BW 3 0 1 0 0 = BW has 3 times more weight reference than DLY Metric formula: Metric = ((107 / BW) + (DLY/10) ) * 256 OSPF The Neighbor IP used with OSPF distance command is the Neighbors Router-ID. “area range” summarize type 3 LSA'. “summary-address” summarize type 5 & 7 LSA's. Auto-cost reference BW (Default = 100mb), formula = Ref-BW/Int-Bw. Switches do no support the interface command “ip ospf {pid} area {area-id}” . OSPF path selection: O > O*IA > O*E1 > O*E2. Using E1 metric type : Packets will be routed out the closest exit point of the network. Using E2 metric type : If you want packets to exit your network at the closest point to their external destination. Don't forget with hub and spoke topology, “ip ospf priority 0″. PITFALL, when forbid to use RID, Loopbacks created later on might change the DR on you network after a reload. PITFALL, when forbid to use RID, Later requested to configure the same loopback on two routers, could break your adjacencies, as two router cant peer with the same RID. “no capability transit” – Mimics OSPFv1 behaviour for all data traffic to pass through Area-0. “max-metric” – Configures OSPF stub configurations “max-lsa” – Limit amount of non-local LSA's “timers throttle lsa all” – Slow down update rate. “timers pacing lsa-group” – Group more LSA's together in updates. “no ip ospf flood-reduction” – Disables every 30-min LSA DB refresh. “ip ospf database filter all out” – Breaks RFC, Stop sending LSA's, but still receive LSA's by CCIE 24163 --------------------------------------------------- Images: --------------------------------------------------- --------------------------------------------------- Post date: 2009-06-12 09:34:29 Post date GMT: 2009-06-12 01:34:29 Post modified date: 2010-07-24 14:32:17 Post modified date GMT: 2010-07-24 06:32:17 ____________________________________________________________________________________________ Export of Post and Page as text file has been powered by [ Universal Post Manager ] plugin from www.gconverters.com