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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 35 Configuring IP Unicast Routing
Configuring ISO CLNS Routing
You can also enable the logging of messages generated when a BGP neighbor resets, comes up, or goes
down by using the bgp log-neighbor changes router configuration command.
Configuring ISO CLNS Routing
The International Organization for Standardization (ISO) Connectionless Network Service (CLNS)
protocol is a standard for the network layer of the Open System Interconnection (OSI) model. Addresses
in the ISO network architecture are referred to as network service access point (NSAP) addresses and
network entity titles (NETs). Each node in an OSI network has one or more NETs. In addition, each node
has many NSAP addresses.
When you enable connectionless routing on the switch by using the clns routing global configuration
command, the switch makes only forwarding decisions, with no routing-related functionality. For
dynamic routing, you must also enable a routing protocol. The switch supports the Intermediate
System-to-Intermediate System (IS-IS) dynamic routing protocols for ISO CLNS networks:
When dynamically routing, you use IS-IS. This routing protocol supports the concept of areas. Within
an area, all routers know how to reach all the system IDs. Between areas, routers know how to reach the
proper area. IS-IS supports two levels of routing: station routing (within an area) and area routing
(between areas).
The key difference between the ISO IGRP and IS-IS NSAP addressing schemes is in the definition of
area addresses. Both use the system ID for Level 1 routing (routing within an area). However, they differ
in the way addresses are specified for area routing. An ISO IGRP NSAP address includes three separate
fields for routing: the domain, area, and system ID. An IS-IS address includes two fields: a single
continuous area field (comprising the domain and area fields) and the system
ID.
show ip bgp inconsistent-as Display the routes with inconsistent originating autonomous
systems.
show ip bgp regexp regular-expression Display the routes that have an AS path that matches the specified
regular expression entered on the command line.
show ip bgp Display the contents of the BGP routing table.
show ip bgp neighbors [address] Display detailed information on the BGP and TCP connections to
individual neighbors.
show ip bgp neighbors [address] [advertised-routes |
dampened-routes | flap-statistics | paths
regular-expression | received-routes | routes]
Display routes learned from a particular BGP neighbor.
show ip bgp paths Display all BGP paths in the database.
show ip bgp peer-group [tag] [summary] Display information about BGP peer groups.
show ip bgp summary Display the status of all BGP connections.
Table 35-11 IP BGP Clear and Show Commands (continued)
Command Purpose