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Telindus 1031 Router
Chapter 7
User manual
106
7.2.4
The rerouting principle
What is the rerouting principle?
If the gateway of a route does not belong to the subnet of an interface, then the Telindus 1031 Router
adds a special route. Then a second route look-up occurs, this time using the gateway field of the route.
This can be used as a back-up functionality as shown below.
Example
Suppose you have the following set-up:
In the routing table, the following routes are defined:
• network 172.31.75.0 is reachable via 172.31.77.10
• 172.31.77.10 is reachable via DLCI 16 (172.31.77.2)
• 172.31.77.10 is also reachable via DLCI 17 (172.31.77.6)
Now in order to reach network 172.31.75.0, DLCI 16 is used. However, when DLCI 16 goes down, the
Telindus 1031 Router automatically uses DLCI 17 in order to reach network 172.31.75.0. I.e. it automat-
ically “reroutes” and this without the need of a routing protocol.
Important remarks
• This only works for the entries of the routing table,
not
for the default gateway.
• This type of route is always up.
• In the status information, the
interface
element of such a route displays
internal
.
172.31.75.0
255.255.255.0
172.31.76.0
255.255.255.0
Frame Relay
DLCI 16
DLCI 17
172.31.77.6
255.255.255.252
172.31.77.5
255.255.255.252
172.31.77.9
255.255.255.248
172.31.77.10
255.255.255.248
172.31.77.11
255.255.255.248
172.31.77.1
255.255.255.252
172.31.77.2
255.255.255.252
Summary of Contents for 1031
Page 11: ...Telindus 1031 Router User manual 1 User manual ...
Page 12: ...Telindus 1031 Router User manual 2 ...
Page 80: ...Telindus 1031 Router Chapter 5 User manual Basic configuration 70 ...
Page 168: ...Telindus 1031 Router Chapter 8 User manual Configuring the bridge 158 ...
Page 179: ...Telindus 1031 Router Reference manual 169 Reference manual ...
Page 180: ...Telindus 1031 Router Reference manual 170 ...
Page 308: ...Telindus 1031 Router Chapter 11 Reference manual Status attributes 298 ...
Page 336: ...Telindus 1031 Router Chapter 12 Reference manual Performance attributes 326 ...
Page 348: ...Telindus 1031 Router Chapter 13 Reference manual Alarm attributes 338 ...
Page 362: ...Telindus 1031 Router Chapter 15 Reference manual Auto installing the Telindus 1031 Router 352 ...
Page 370: ...Telindus 1031 Router Chapter 16 Reference manual Downloading software 360 ...
Page 380: ...Telindus 1031 Router Chapter 17 Reference manual Technical specifications 370 ...
Page 381: ...Telindus 1031 Router Annex 371 Annex ...
Page 382: ...Telindus 1031 Router Annex 372 ...
Page 384: ...Telindus 1031 Router Annex A Annex common TCP and UDP numbers 374 ...
Page 386: ...Telindus 1031 Router Annex B Annex product information 376 ...