Term
| what routes will be redistributed with the "redist eigrp" command? |
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Definition
| learned eigrp internal routes and connected interfaces. |
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Term
| what if you don't want to redsitribute connected routes? |
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Definition
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Term
| redistribution behaviour of distance vector protocols? |
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Definition
| routes must be used in the routing table if they are to be redistributed. |
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Term
| redistribution behaviour of ospf? |
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Definition
| routes can be redistributed if they are in the database and have routing bit set. This is not always the case, such as when there are duplicate RIDs in the network. |
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Term
| redistribution behaviour of bgp? |
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Definition
| can be redistributed if in the BGP table. Will show "RIB failure" if IGP is preferred over iBGP. |
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Term
| what if multiple processes of the same protocol advertise the same route with the same metric? |
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Definition
| lowest process ID will be chosen. |
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Term
| what if different protocols have had their AD changed to the same value? |
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Definition
| default values will be used. |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| doesn't have one. Set during redistribution or with "default-metric". |
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Term
| default EIGRP seed metric? |
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Definition
connected/static will use interface metric.
Protocols will require:
1. define during redist.
2. default-metric.
3. route-map. |
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Term
| default OSPF seed metric? |
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Definition
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Term
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Definition
intra > inter > E1 > N1 > E2 > N2
E1 & N1 vs E2 & N2 - forward metric is key for E2/N2. |
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Term
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Definition
| denied by default, must be specified "redistribute ospf {pid} match internal external" |
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Term
| OSPF classfull/classless considrations. |
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Definition
| use the "subnets" keyword when redistributing with OSPF. |
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Term
| ospf/eigrp loop prevention? |
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Definition
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Term
| loop/feedback prevention strategy? |
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Definition
1. protect higher AD routes from feedback.
2. ensure router always routes to source protocol.
3. prevent sub-optimal routing. |
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Term
| preventing loops and feedback - methods. |
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Definition
Tagging
mutual redistribution
distance
filtering with distribute-lists etc. |
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Term
| describe control plane loop. |
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Definition
unstable routing - route thrashing or count to infinity.
Partial reachability. |
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Term
| describe data plane loop. |
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Definition
routing is settled, but wrong (looped) path is selected.
No reachability. |
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Term
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Definition
ping script.
Debug ip routing, problem router will give reason for routing changes.
Check age of routes.
Ip route profile.
Traceroute. |
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Term
| ospf distribute-list banana skin? |
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Definition
| black holes - only removes from routing table. |
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Term
| ospf distance banana skin? |
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Definition
| only locally significant, may lead to data plane loops. |
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Term
| "ip route profile" config? |
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Definition
"ip route profile" - takes periodic snapshot of routing table and changes.
"sh ip route profile" - only top row should be populated. |
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Term
| how does 2-way redistribution at multiple points help? |
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Definition
| router will not listen to routes it is also redistributing. |
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