- Enterasys Security Router User's Guide

IP Routing Protocols
XSR User’s Guide 5-11
•Static routes
• Route redistribution
• Default network
• CIDR (classless IP)
•Configurable Router ID
• Route Preference
When you run multiple routing protocols, the XSR assigns a weight to each of them. For more
information, refer to “Route Preference” on page 5-17.
RIPv1 and v2
The Routing Information Protocol (RIP) is a distance-vector protocol based on the Bellman-Ford
algorithm to learn the shortest path between two points in a network. RIP is used only on
networks whose longest path is 15 hops or less and is marked by the following limits on the XSR:
• MD5 authentication is not supported
• Distribution lists require an ACL to be configured
RIP uses request and response messages. Requests ask for all or part of routing table entries and
responses can be sent for one of these reasons:
• Response to a specific query
• Regular updates (unsolicited response)
• Triggered updates caused by a route change
RIP specifications are RFC-1058 for RIPv1 and RFC-2453 for RIPv2. It is supported on the XSR
with the following features:
• Set globally with the
router rip and per interface with the network commands: they
support RIP on both LAN and WAN interfaces with these default values: Receive RIPv1 and
v2, Transmit RIPv1, no redistribution, no filtering and Split Horizon with no poison.
• Redistribute static routes into RIP with the
redistribute command
• Redistribute RIP into OSPF and vice versa with the
redistribute rip and redistribute
ospf
commands
• Split horizon with poisoned reverse enabled with
ip split-horizon
• Triggered updates delivered by default or disabled by ip rip disable-triggered-updates
• Clear text authentication enabled by ip rip authentication mode
• RIP is configurable for:
– Send only mode set by issuing
no received interface to prevent RIP from receiving
update packets on a specified port
– Receive only mode set by issuing
passive interface to prevent RIP from sending update
packets on a specified port
Note: RIP commands configured under Interface mode are independent of enabling/disabling the
RIP protocol.