User`s guide

Configuring IP Routing
Managing the routing table
Pipeline User’s Guide Preliminary January 30, 1998 2-29
This is a count of the number of times the route has been referenced since it
was created. (Many of the references are internal, so this is not a count of the
number of packets sent using this route.)
Unused routes are indicated by a 0 in the Use column.
•Age
This is the age of the route in seconds. It is used for troubleshooting, to
determine when routes are changing rapidly (referred to as “flapping”).
Removing down routes to a host
The Pipeline advertises addresses associated with Connection profiles as routes
to which it can connect. By default, it advertises these addresses even when a link
is down, because they are necessary for the on-demand connections that the
Pipeline establishes.
For a nailed connection, it is assumed that the connection is always up. If it is not,
the routes to that connection are not necessary until the connection comes back
up. For example:
Pipeline 1 and Pipeline 2 are on the same local LAN.
• Pipeline 1 has a nailed connection to a remote site.
The remote address has a metric of 4.
• Pipeline 2 is a backup connection.
It has a remote address with a metric of 7.
Traffic goes through Pipeline 1 because of the lower metric. If its connection
goes down, its route to the remote network is still advertised by default.
Therefore, the connection specified by Pipeline 2 never comes up.
To remove the route of a down, nailed connection, set the Temporary parameter
in Ethernet > Connection > profile of down connection > IP options submenu to
Yes. When the Temporary parameter is set to Yes, a route to a nailed connection
is removed from the routing table when the link is down, including all routes
dynamically learned on this connection, and discontinues advertising the route.
The routes are advertised and reappear in the routing table only when you re-
establish the connection.