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IP R
OUTING
3-297
Command Usage
Specifying Receive and Send Protocol Types
• Setting the RIP Receive Version or Send Version for an interface
overrides the global setting specified by the RIP / General Settings,
Global RIP Version field.
• You can specify the Receive Version based on these options:
- Use “RIPv1” or “RIPv2” if all routers in the local network are based
on RIPv1 or RIPv2, respectively.
- Use “RIPv1 or RIPv2” if some routers in the local network are using
RIPv2, but there are still some older routers using RIPv1.
- Use “Do Not Receive” if you do not want to add any dynamic entries
to the routing table for an interface. (For example, you may only want
to allow static routes for a specific interface.)
• You can specify the Send Version based on these options:
- Use “RIPv1” or “RIPv2” if all routers in the local network are based
on RIPv1 or RIPv2, respectively.
- Use “RIPv1 Compatible” to propagate route information by
broadcasting to other routers on the network using the RIPv2
advertisement list, instead of multicasting as normally required by
RIPv2. (Using this mode allows RIPv1 routers to receive these
protocol messages, but still allows RIPv2 routers to receive the
additional information provided by RIPv2, including subnet mask,
next hop and authentication information.)
- Use “Do Not Send” to passively monitor route information
advertised by other routers attached to the network.
Loopback Prevention
Just as Layer 2 switches use the Spanning Tree Algorithm to prevent loops,
routers also use methods for preventing loops that would cause endless
retransmission of data traffic. When protocol packets are caught in a loop,
links will be congested, and protocol packets may be lost. However, the
network will slowly converge to the new state. RIP utilizes the following