3Com 3C13636 Configuration Manual page 581

3Com Router 3000 Ethernet Family
Configuration Guide
Perform the following configuration in RIP view.
Table 3-9 Configure route aggregation
Enable the route aggregation function of
RIP-2
Disable the route aggregation function of
RIP-2
By default, RIP-2 route aggregation is enabled.
3.2.9 Configuring Route Exchange of Indirectly Connected RIP Neighbors
By default, RIP sends RIP packets to directly connected segments only. When sending
a unicast packet, RIP checks if the destination is directly connected; when receiving a
RIP packet, RIP checks the source address and tries to find the ingress interface.
According to this kind of mechanism, when two routers are indirectly connected RIP
neighbors, no RIP information exchanging can take place.
loopback0:
100.0.0.1/8
RouterA
Figure 3-1 Route exchange of indirectly connected RIP neighbors
As shown in the above figure, if RouterA and RouterC are indirectly connected
neighbors (only the 1.0.0.0/8 segment of RouterA and the 2.0.0.0/8 segment of
RouterC are RIP-enabled, whereas RouterB is not RIP-enabled), to have RouterA and
RouterC to exchange RIP routing information, configure as follows:
Configure RouterA and RouterC to be RIP peers.
Disable the checking of the source address of a received RIP packet.
After the above configuration, when sending unicast packets, the routers do not check
the destination address for a directly connected address and removes the flag
information that can prevent Router B from forwarding the packets; when receiving a
RIP packet, they do not check the source address of the packet, and can use the
source address and destination address of the packet to locate the ingress interface.
I. Configuring unicast of RIP packets
Generally, RIP forwards packets using broadcast or multicast addresses. To run RIP on
a link not supporting broadcast packets, you must employ unicast transmission;
otherwise, the RIP neighborhood cannot be established properly. You must also
Operation
e1/0/0: e1/0/0:
1.0.0.1/8 1.0.0.2/8
RouterB
3Com Corporation
3-10
Chapter 3 RIP Configuration
Command
summary
undo summary
e1/0/1: e1/0/1:
2.0.0.2/8 2.0.0.1/8
loopback0:
200.0.0.1/24
RouterC