Osi Routing; Figure 13-21 Osi Main Setup - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

13.6.4 OSI Routing

Figure 13-21
This address is also the Router 1 primary manual area address, which is viewed and edited on the
Provisioning > OSI > Routers subtab. See the
information about the OSI router and manual area addresses in CTC.
13.6.4 OSI Routing
OSI architecture includes ESs and ISs. The OSI routing scheme includes:
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•
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OSI Main Setup
A set of routing protocols that allow ESs and ISs to collect and distribute the information necessary
to determine routes. Protocols include the ES-IS and IS-IS protocols. ES-IS routing establishes
connectivity and reach ability among ESs and ISs attached to the same (single) subnetwork.
A routing information base (RIB) (see containing this information, from which routes between ESs
can be computed. The RIB consists of a table of entries that identify a destination (for example, an
NSAP), the subnetwork over which packets should be forwarded to reach that destination, and a
routing metric. The routing metric communicates characteristics of the route (such as delay
properties or expected error rate) that are used to evaluate the suitability of a route compared to
another route with different properties, for transporting a particular packet or class of packets.
A routing algorithm, Shortest Path First (SPF), that uses information contained in the RIB to derive
routes between ESs.
Chapter 13
"13.6.7 OSI Virtual Routers" section on page 13-41
Management Network Connectivity
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