Routing and WAN connections
362
11.2
IP routing
BAT54-Rail/F..
Release
7.54
06/08
11.2.4 Dynamic routing with IP RIP
In addition to the static routing table, Hirschmann routers also have a dynam-
ic routing table. Unlike the static table, you do not fill this out yourself, but
leave it to be dealt with by the router itself. It uses the Routing Information
Protocol (RIP) for this purpose. All devices that support RIP use this protocol
to exchange information on the available routes.
U What information is propagated by IP RIP?
A router uses the IP RIP information to inform the other routers in the network
of the routes it finds in its own static table. The following entries are ignored
in this process:
D Rejected routes with the '0.0.0.0' router setting.
D Routes referring to other routers in the local network.
D Routes linking individual computers to the LAN by proxy ARP.
Although the entries in the static routing table are set manually, this informa-
tion changes according to the connection status of the router and so do the
RIP packets transmitted.
D If the router has established a connection to a remote station, it propa-
gates all the networks which can be reached via this route in the RIPs with
the distance '1'. Other routers in the LAN are thus informed by these
means that a connection to the remote station has been established on
this router which they can use. The establishment of additional connec-
tions by routers with dial-up connections can be prevented, thus reducing
connection costs.
D If this router cannot establish a further connection to another remote sta-
tion, all other routes are propagated with the distance '16' in the RIPs. The
'16' stands for “This route is not available at the moment”. A router may
be prevented from establishing a connection in addition to the present one
may be due to one of the following causes:
D Another connection has already been established on all the other
channels (also via the LANCAPI).
D Y connections for the S
0
port have been explicitly excluded in the in-
terface table.
D The existing connection is using all B channels (channel bundling).
D The existing connection is a leased-line connection. Only a few ISDN
providers enable a dial-up connection to be established on the second
B channel in addition to a permanent connection on the first B channel.
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