Carrier Access CMG Router - Manual (Page 96)

4-10 CMG Router - Release 2.7
Profile Directory:Local Profile
Static Networks
Static Networks
Static networks allow fixed, or pre-determined routes, which increases the control over
routing choices within your network. Although Adit units are able to dynamically learn
routing information through RIP packets, you may wish to disable this feature and
manually enter fixed routes. (Disable Learning by choosing the <Neither> option in
the LAN Network Updates field on the Local (LAN) Profile Setup screen.) Static
routing may be preferred if:
Routers within a network are not configured to advertise, thereby escaping the
automatic learning capabilities of the Adit unit
Advertising is disabled so that access to certain networks may be restricted for
security purposes or, to decrease traffic on the LAN and across the WAN
You wish to keep routing tables small in order to increase LAN/WAN
performance
Static routing may also be preferable when managing large networks. Often times it is
easier to disable the learning mode and manually enter routes, rather than review each
routing table entry and determine its advertising status.
As a static routing example, let’s assume that we have three networks, A, B and C.
Network B, is connected to Network C via a router, and to Network A via a remote
Adit. Network B may not learn of Network A’s existence if advertising was disabled
on Router 1. Therefore, if you wish to establish an entry in the routing table indicating
a route between Network B and Network C, you can define a static route on Network B.
Network B Network C
Router 1
Network A
Enter a static route which
indicates that Network C
may be reached through
Router 1.
Enter a static route which
indicates that Network C
may be reached through
remote Unit B.
Unit
A
Unit
B