Configuration Guide

Table Of Contents
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October 2021
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11. ISIS Metrics - Optional
You can configure the link metric to overwrite the default metric value. By configuring the metric, you can
specify a preferred path. Low cost reflects high-speed media, and high cost reflects slower media. For the
wide metric, the value ranges from 1 to 16,777,215.
SPBM uses the L1-SPB metric defined in a new SPB sub-TLV
The total cost of a path equals the sum of the cost of each link
If a link has different metric values configured at each end of the link, SPBM will use the highest
metric value
The default value for wide metrics is 10
As an option, you can change the wide metric to the suggested values as shown in the table below to allow
the switch to prefer the higher speed NNI links over the lower speed links.
Link Speed (Gbps) Interface Type ISIS L1-metric
1
Native Ethernet 2000
2
MLT bundle 1000
10 Native Ethernet 200
20 MLT bundle 100
40 Native Ethernet 50
80 MLT bundle / FI 25
100 Native Ethernet 20
120 MLT bundle / FI 17
160 MLT bundle 13
Table 9: ISIS Metric Option
By default, all Fabric Interconnect ports operating in rear-port mode use the same LACP key
(4095) on the VSP 7000. If you modify a rear-port metric, such as the SPBM-L1–Metric, the
modification applies to all ports which have the same LACP key. If different metrics are to be
used on specific rear-ports, you will need to set different LACP keys on those ports.