User's Manual

692 CHAPTER 17: USING 3COM NETWORK DIRECTOR ON A MULTI-SITE NETWORK
topology for. Deleting the link removed the representations of all of
those WAN interfaces from the map.
By setting the appropriate end of a newly added link to one of the WAN
interfaces of the router you restored the map representation for that
interface only. You can automatically restore the representation of the
other WAN interfaces by rediscovering one of the subnets that the router
has an IP address on.
If you intending making any further changes to the WAN topology after
deleting such a link, and these changes involve either one or more of the
interfaces whose representation has been removed from the map, or
other routers on the same subnet as the router that the link was
connected to, then it is recommended that you postpone the rediscovery
until after you have completed all of those changes. Doing so will mean
that you only need to perform one rediscovery of that subnet and so will
reduce the amount of traffic generated by the discovery operation.
Manual Layout of WAN Topology and Rediscovery
3Com Network Director assumes that manual modifications made to the
WAN topology accurately reflect the real WAN topology of your network.
As a result, subsequent network discoveries will not alter the topology
you have put in place for the existing WAN interfaces in the map.
However, any new WAN interfaces discovered during subsequent
network discoveries will be linked into the single Default WAN cloud as
usual. If you have deleted this cloud from the map then it will be
recreated automatically in order to accommodate this.
Monitoring WAN
links
3Com Network Director ensures that all WAN links are displayed in the
map terminating at a cloud. For example, if you manually alter the
topology to show the correct connection of a point-to-point link then
that link will automatically be divided into two halves, with both halves of
the link terminating at the same cloud. See “
Connecting Point-to-Point
WAN Interfaces Together” on page 688 for details of how to manually
alter the topology for a point-to-point link.
Displaying the WAN links in this manner allows you to choose the
appropriate end or ends for monitoring the WAN link:
■ If you want to monitor a point-to-point WAN link and only need to
monitor the WAN link using one of the two routers then you can