Term
| methods to speed up convergence. |
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Definition
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Term
| command to run bfd on all interfaces. |
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Definition
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Term
| command to enable bfd on an interface using minimal settings |
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Definition
| bfd interval 50 min-rx 50 multiplier 3 |
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Term
| why is bfd preferred over using really fast eigrp hellos? |
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Definition
| bfd hellos are processed in hardware, eigrp hellos are processed using the CPU. |
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Term
| command to verify bfd config |
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Definition
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Term
| is there any reason why you wouldn’t use BFD? |
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Definition
| if the device can't offload to hardware. |
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Term
| command to summarise in eigrp |
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Definition
ip summary-add eig 100 - classic
summary-address - named |
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Term
| Are more specific routes still advertised when a summary is configured? |
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Definition
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Term
| a router advertises a summary, packets are routed to the router based on that summary but the router does not have a more specific route. What happends to that traffic. |
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Definition
| It will be null routed using the local summary route. |
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Term
| command to verify that all neighbors are converged. |
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Definition
sh ip eig nei
ensure Q Cnt is 0 for all neighbors. |
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Term
| how are discontiguous major networks handled when auto-summary is enabled in eigrp? |
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Definition
vlsm is only supported for subnets within same major network.
Classful summaries are advertised between major network boundaries.
Routers install local eigrp summaries to null0. |
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Term
| command to advertise a default route in classic mode |
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Definition
ip summary-add eig 100 0.0.0.0 0.0.0.0
there is no default-information originate in eigrp. |
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Term
| how can you prevent select routes from being suppressed when configuring summarisation. |
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Definition
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Term
| what happens if you poison a locally configured summary with the "summary-metric" command and a value of 255? |
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Definition
no summary local summary is installed.
No summary is advertised.
Specific routes are still suppressed. |
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Term
| command to ensure eigrp uses no more than 60% of an interfaces bandwidth. |
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Definition
| ip bandwidth-percent eigrp 100 60 |
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Term
| command to define the metric assigned to routes redistributed into eigrp on the router. |
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Definition
| default-metric 100000 10 255 1 1500 |
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Term
| what happens to a neighbor who is declared sia? |
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Definition
| it is removed from the neighbor table. |
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Term
| what are symptoms of sia routes? |
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Definition
1. when neighbors disappear from neighbor tables and then reappear.
2. intermittent unreachable destinations. |
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Term
| command to view sia activity. |
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Definition
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Term
| what are common causes of sia in larger eigrp networks? |
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Definition
1. heavily congested low bandwidth links.
2. routers with low memory and hogh cpu utilisation.
3. careless use of the interface "bandwidth" command |
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Term
| default value for sia-retransmit timer. |
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Definition
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Term
| how many sia-queries will be sent if replies are received? |
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Definition
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Term
| assuming default settings, how long will it be before a neighbor is declared sia if replies are received to all sia-queries? |
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Definition
6 mins.
A sia-query is sent every 90 secs, the router will wait 90 secs after the final sia-query. |
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