Allied Telesis AT-8100 Series - Manual (Page 1830)

Chapter 104: Internet Protocol Version 4 Packet Routing
1830
Activating RIP Rather than adding static routes to remote destinations, or perhaps to
augment them, you decide to activate RIP to allow the switch to learn new
routes by advertising its routing table to its neighbors. The switch has a
series of RIP commands, but this section mentions only two of them. The
first command is the NETWORK command in the Router Configuration
mode. You use this command to perform two functions. You use it to
indicate which of the local networks are to be advertised to the RIP
neighbors and which VLANs are to transmit the RIP update packets. Here
is the format of the command:
network ipaddress/mask | vlanid
You can identify the VLAN by the network address and mask of its routing
interface or the VID of the VLAN, preceded by “VLAN.”
The other command is the PASSIVE-INTERFACE command, also found
in the Router Configuration mode. You use this command to block VLANs,
on which RIP has been activated, from transmitting RIP update packets.
This command is intended for VLANs that are not connected to RIP
neighbors. Here is the format of the command:
passive-network vlanid
You identify the interface by its VID number.
Returning to the example in Table 252 on page 1825, assume that the
Inventory VLAN has a RIP neighbor to which the switch is to transmit and
receive RIP update packets. To activate RIP on the VLAN so that it
transmits and receives RIP packets and to include the Inventory network
in the advertisements, you use the NETWORK command in the Router
Configuration mode.
Also assume you want the switch to advertise all four local networks in the
RIP update packets, but not transmit RIP update packets on the Sales,
Production, and Engineering VLANs because they are not connected to
RIP neighbors. To accomplish that, you need to perform the NETWORK
command on three VLANs so that RIP includes their networks in the RIP
update packets, and the PASSIVE-INTERFACE command to keep the
VLANs from advertising RIP update packets.
Here are the commands for activating RIP on the four VLANs. Note that
the PASSIVE-INTERFACE command is used to block the Sales,
Production, and Engineering VLANs (VIDs 4, 5, and 11, respectively) from
advertising RIP update packets, because in our example, the VLANs are
not connected to RIP neighbors. The command is not performed on the
Inventory VLAN (VID 15), because it is connected to a RIP neighbor: