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ipv6-address/
prefix-len
Enter an IPv6 address in X:X:X:X::X format. The valid IPv6
prefix lengths are from /0 to / 128.
Defaults none
Command
Modes
CONFIGURATION
Command
History
Version Description
9.7(0.0) Introduced on the S6000-ON.
8.3.12.0 Introduced on the S4810.
8.4.1.0 Introduced.
Usage
Information
Use this command to create an object that tracks the reachability of an IPv6 route.
In order for a route’s reachability to be tracked, the route must appear as an entry
in the routing table.
A tracked route is considered to match an entry in the routing table only if the
exact IPv6 address and prefix length match a table entry. For example, when
configured as a tracked route, 3333:100:200:300:400::/80 does not match routing
table entry 3333:100:200:300::/64. If no route-table entry has the exact IPv6
address and prefix length, the tracked route is considered to be DOWN.
When you configure IPv6 route reachability as a tracked object, the UP/DOWN
state of the tracked route is also determined by the entry of the next-hop address
in the ARP cache. A tracked route is considered to be reachable if there is an ARP
cache entry for the route's next-hop address.
If the next-hop address in the ARP cache ages out for a route tracked for its
reachability, an attempt is made to regenerate the ARP cache entry to if the next-
hop address appears before considering the route DOWN.
Related
Commands
• show track ipv6 route – displays information about tracked IPv6 routes,
including configuration, current state, and clients which track the route.
• track ipv6 route reachability – configures object tracking on the reachability of
an IPv4 route.
track resolution ipv6 route
Configure the protocol-specific resolution value used to scale an IPv6 route metric.
Syntax
track resolution ipv6 route {isis resolution-value | ospf
resolution-value}
To return to the default setting, use the no track object-id command.
1258
Object Tracking