Carrier Access CMG Router - Manual (Page 147)

CMG Router - Release 2.7 5-15
Profile Directory:Remote Profile
Static/VPN Networks
Static/VPN Networks
Static networks allow you to establish fixed, or pre-determined routes, which increases
the control that you have 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
selecting the <Never> option in the WAN Network Updates field on the Remote
(WAN) Profile Setup window. Static routing may be preferred if:
Routers that are not configured to advertise, cannot utilize the automatic learning
capabilities of the Adit
Advertising is disabled for security purposes
Keeping routing tables small in order to increase LAN/WAN performance
Advertising is disabled to decrease traffic on the LAN and across the WAN
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
Unit
A
Unit
B
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.