Cabletron Systems 2.2 Manuel D’Utilisation
Viewing and Managing Bridging Interfaces
2-5
Bridging
cache, append the proper Routing Information onto the packet, and then forward
the data to the Token Ring segment.
the data to the Token Ring segment.
The RIF cache is a software table that can store up to 8192 entries. An SR-TB
bridge updates its RIF cache much like a Transparent bridge dynamically updates
its Filtering Database: it learns new address information by listening to incoming
packets on each port, saves that information to an Address Database, andÑif the
address was learned to be Source-Route capableÑupdates routing information
for that source address in the RIF cache. Every time a packet arrives from an FDDI
interface for a MAC address that is communicating through the SR-TB bridgeÕs
front panel, the RIF cache table is searched for an address/RIF match.
bridge updates its RIF cache much like a Transparent bridge dynamically updates
its Filtering Database: it learns new address information by listening to incoming
packets on each port, saves that information to an Address Database, andÑif the
address was learned to be Source-Route capableÑupdates routing information
for that source address in the RIF cache. Every time a packet arrives from an FDDI
interface for a MAC address that is communicating through the SR-TB bridgeÕs
front panel, the RIF cache table is searched for an address/RIF match.
There are conÞguration issues when a Token Ring module receives a packet from
an FDDI interface for a destination address that is unknown, and not in its
Address Database or RIF cache. You must conÞgure your SR-TB bridge to treat
incoming packets with an unknown destination address as either a Source Route
or Transparently bridged packet (since Token Ring end stations attached to the
module may or may not support Source Routing).
an FDDI interface for a destination address that is unknown, and not in its
Address Database or RIF cache. You must conÞgure your SR-TB bridge to treat
incoming packets with an unknown destination address as either a Source Route
or Transparently bridged packet (since Token Ring end stations attached to the
module may or may not support Source Routing).
If the bridge is conÞgured to treat an incoming packet with unknown addresses as
a Source Routed frame, it will forward it using either STE or ARE frames. If the
bridge is conÞgured to treat an incoming packet with an unknown destination as
a Transparently bridged frame, it simply forwards the frame.
a Source Routed frame, it will forward it using either STE or ARE frames. If the
bridge is conÞgured to treat an incoming packet with an unknown destination as
a Transparently bridged frame, it simply forwards the frame.
After a packet with a previously unknown destination has been bridged
successfully, and communication begins between the two end nodes, the RIF
cache will be updated and packets will be translated as described previously.
successfully, and communication begins between the two end nodes, the RIF
cache will be updated and packets will be translated as described previously.
Viewing and Managing Bridging Interfaces
With SPECTRUM Element Manager, you can view and manage each bridging
interface supported by your device, including any installed interface modules,
such as BRIMs (Bridge/Router Interface Modules) and HSIMs (High Speed
Interface Modules).
interface supported by your device, including any installed interface modules,
such as BRIMs (Bridge/Router Interface Modules) and HSIMs (High Speed
Interface Modules).
You can manage your bridge by using the following windows:
¥
The Bridge Status window provides you with basic information about the
current status of the deviceÕs bridging interfaces, and allow you to enable or
disable bridging at each of those interfaces. The Bridge Status window also lets
you access further windows to conÞgure bridging at the device. See
current status of the deviceÕs bridging interfaces, and allow you to enable or
disable bridging at each of those interfaces. The Bridge Status window also lets
you access further windows to conÞgure bridging at the device. See
,
¥
Bridge statisticsÑincluding the Performance Graph, Interface Statistics,
CSMACD Statistics
CSMACD Statistics
, PPP Link Statistics, Dot5 Error Statistics, and Source
Route Statistics
windowsÑgraphically display the trafÞc passing between
your bridged networks, and let you compare and contrast trafÞc and errors
processed by each interface. See
processed by each interface. See