SPRI-ISIS Flashcards
Q
A
IS-IS originally only had a metric range from 1 to 63
True
ISIS Route Selection is based on the following process: L2 over L1 - select Level 2 routes over Level 1 routes. Internal over External - if levels are equal, select internal
False
ISIS Route Selection is based on the following process: Lowest Metric - if types are the same select route with lowest metric. Load Share - if metric is the same for multiple routes, load-share.
True, True
The following are some of the suggested IS-IS path selection design approaches: Use wide metric on all routers in the autonomous system. Change the default metric (10) to a lower value to prevent new unconfigured high interfaces from attracting traffic.
True, False: Change the default metric (10) to a high value to prevent new unconfigured slow interfaces from attracting traffic.
The following are some of the suggested IS-IS path selection design approaches: Design a metric plan as there is no automatic metric calculation in IS-IS. You can borrow the OSPF formula to linearly map the link speeds to IS-IS metric.
True, True
Redistribution in ISIS on an L1/L2 router can be done distinctly for the L1 and L2 databases.
True
Summarization in ISIS on an L1/L2 router cannot be done distinctly for the L1 and L2 databases.
False, it can be done.
Command used for summarization in IOS ISIS
summary-address 10.1.0.0 255.255.255.0 level-1
Command used for summarization in IOS-XR ISIS
summary-prefix 10.1.0.0 255.255.255.0 level-1
The metric of the summarized route will be the lowest metric among the summarized prefixes.
True
The drawback of summary addresses is that other routes might have less information to calculate the most optimal routing table for all individual destinations.
True
What is the default convergence timer?
30 seconds
What command disables ISIS at the protocol level?
protocol shutdown
IOS uses multi-topology by default.
False
