ISIS uses cost of outgoing interface
metric—Metric value.
Range: 1 through 63, or 1 through 16,777,215 (if you have configured wide metrics)
Default: 10 (for all interfaces except lo0), 0 (for the lo0 interface)
Correct answer is 73. Because Metric calculation on OSPF/ISIS is always added in inbound direction. Only difference is OSPF add Metrc-1 and ISIS add Metric-10 by default.
C is the correct answer
root@vMX-3> show route 1.1.1.1
inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
1.1.1.1/32 *[IS-IS/18] 00:01:24, metric 20
> to 10.1.0.5 via ge-0/0/1.0
C 20 is correct labbed it up. Cost is of outgoing interfaces of the packetpath, or incoming interfaces where the router receives the LSP and add’s the metric of that interface.
"C" is the right one, cause they are asking about metric from R3 to R1. we have "R3 ge-0/0/1.0 (10) + R2 ge-0/0/0.0 (10) = 20
If they ask about metric from R1 to R3, 300 metric on R2 is ignored because wide-metric is not enable so the metric would be 73. R1 ge-0/0/0.0 (10) + R2 ge-0/0/1.0 (63) = 73
nm "B" With "wide-metrics-only" not configured the maximum metric of the outgoing interface is limited to 63 so 63+10=73
"D" would only be correct if the "wide-metrics-only" command were present. "C" would only be correct if R2's G0/0/1 interface metric wasn't set to 300.
"C" final answer, cost is calculated via outbound interfaces G0/0/1.0 is not an outbound interface...wish I could delete these but at least this lets know why it's C...
C = correct.
ISIS advertises it metric in TLV, without "wide-metric-only" this is maximum 63. so R2 advertises its metric to R3. metric = 300, capped to 63 maximum
metric from R1 > R2 = 10 (default), makes total 73.
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