Cabletron Systems SmartSwitch - Manual (Page 86)

Chapter 6: IP Routing Configuration Guide
86 SmartSwitch Router User Reference Manual
The SSR supports standards-based TCP, UDP, and IP.
IP Routing Protocols
The SSR supports standards-based unicast and multicast routing. Unicast routing protocol
support includes Interior Gateway Protocols and Exterior Gateway Protocols. Multicast
routing protocols are used to determine how multicast data is transferred in a routed
environment.
Unicast Routing Protocols
Interior Gateway Protocols are used for routing networks that are within an “autonomous
system,” a network of relatively limited size. All IP interior gateway protocols must be
specified with a list of associated networks before routing activities can begin. A routing
process listens to updates from other routers on these networks and broadcasts its own
routing information on those same networks. The SSR supports the following Interior
Gateway Protocols:
• Routing Information Protocol (RIP) Version 1, 2 (RFC 1058, 1723)
• Open Shortest Path First (OSPF) Version 2 (RFC 1583)
Exterior Gateway Protocols are used to transfer information between different
“autonomous systems”. The SSR supports the following Exterior Gateway Protocol:
• Border Gateway Protocol (BGP) Version 3, 4 (RFC 1267, 1771)
Multicast Routing Protocols
IP multicasting allows a host to send traffic to a subset of all hosts. These hosts subscribe
to group membership, thus notifying the SSR of participation in a multicast transmission.
Multicast routing protocols are used to determine which routers have directly attached
hosts, as specified by IGMP, that have membership to a multicast session. Once host
memberships are determined, routers use multicast routing protocols, such as DVMRP, to
forward multicast traffic between routers.
The SSR supports the following multicast routing protocols:
• Distance Vector Multicast Routing Protocol (DVMRP) RFC 1075
• Internet Group Management Protocol (IGMP) as described in RFC 2236
The SSR also supports the latest DVMRP Version 3.0 draft specification, which includes
mtrace, Generation ID and Pruning/Grafting.