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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 165
Link-State Age
Optio
Link-State ID
Advertising Router
Link-State Sequence Num
Link-State Checksum
Network Mask
TOS Metric
AS External Link Advertisem
Forwarding Address
External Route Tag
E
ns
ber
Length
ents
5
Figure 5-32. AS External Link Advertisement
Field Description
Network Mask The IP address mask for
the advertised
destination.
E – bit The type of external
metric. If the E – bit is
set, the metric specified is
a Type 2 external metric.
This means the metric is
considered larger than
any link state path. If the
E – bit is zero, the
specified metric is a Type
1 external metric. This
means that is comparable
directl
y
to the link state