Foundry Networks Switch and Router Installation And Configuration Manual page 232

Foundry Switch and Router Installation and Configuration Guide
• AppleTalk Transaction Protocol (ATP) – AppleTalk equivalent of IP/TCP
NOTE: A sub-set of ATP is implemented to support ZIP on Foundry Layer 3 Switches.
• Name Binding Protocol (NBP) – AppleTalk equivalent of IP/DNS
AppleTalk Zone and Network Filters
Zone filters and network filters enable you to control access to AppleTalk networks and individual nodes:
• Zone filters – Explicitly permit or deny access to specific zones on specific ports
• Network filters – Explicitly permit or deny access to specific networks on specific ports
IP Multicast Routing (PIM and DVMRP)
Multicast protocols allow a group or channel to be accessed over different networks by multiple stations (clients)
for the receipt and transmit of multicast routing. Distribution of stock quotes, video transmissions, such as news
services or remote classrooms and video conferencing, are all examples of multicast routing.
Foundry routers support the following IP multicast protocols:
• Distance Vector Multicast Routing Protocol (DVMRP) – a broadcast and pruning multicast protocol that
delivers IP multicast datagrams to its intended receivers.
• Internet Group Membership Protocol (IGMP) – a protocol used by DVMRP routers to advertise multicast
groups to the routers that are distributing the multicasts.
• Protocol Independent Multicast (PIM) protocol – an alternative to DVMRP that uses the router's IP route table
rather than maintaining a separate multicast route table as DVMRP does.
DVMRP and PIM can concurrently operate on different ports of a Foundry router.
For both versions of IP multicast, Foundry Layer 3 Switches support IP tunneling. IP tunneling allows Foundry
Layer 3 Switches that are performing IP multicast to send multicast traffic through routers that do not support
either PIM or DVMRP multicasting.
For more details on configuring the Foundry Layer 3 Switches for IP multicast, see "Configuring IP Multicast
Protocols" on page 18-1.
Redistribution Filters
Foundry routers allow you to configure parameters for redistributing routes among the following routing protocols:
• IP/RIP
• IP/OSPF
• IP/BGP4
For example, a Foundry router running OSPF and RIP can pass a route learned through RIP to OSPF. The router
associates a metric and other parameters with a route when the router redistributes the route to other protocols.
You can modify these parameters and permit or deny routes from being distributed using route distribution filters.
You define the filters for each of the protocols that redistributes the routes. For example, if you want to control
how the router redistributes routes learned through RIP to OSPF, you use IP/RIP commands, Web management
screens, or IronView management screens to define the filters.
User Datagram Protocol (UDP) Helper
Foundry routers can relay UDP packets to their destination for a specific application even when the destination
server is not on the local LAN segment. For example, a Foundry router can relay UDP packets for the following
applications to their destination nodes: bootps, domain, and tftp. This feature is especially useful for configuring
the Foundry router to help DHCP packets reach their intended server and client.
8 - 24 December 2000