Cabletron Systems CyberSWITCH CSX500 Specifications download pdf (Page 67)

Bridging and Routing Configuration

QuickSET Configuration Guide 51

Modify IP Host Window

The Modify IP Host window (Figure 52, below) appears when you click on the Modify button in

the IP Host Map window. The host data displayed will correspond to the Interface Number

displayed in the IP Host Map window. When you have ﬁnished modifying the data, click the OK

button to enter the new data into the database. The database will be saved when you click the Save

button and then exit QuickSET.

Figure 52 Modify IP Host Window

OSPF Settings — The OSPF Settings window shown in Figure 53, on the following page,

displays after clicking on the OSPF button in the Advanced Routing Conﬁguration window. OSPF

OSPF (Open Shortest Path First) is a Link-State Protocol. OSPF distributes routing information

between routers belonging to a single Autonomous System (AS). In an Autonomous System,

routers exchange routing information through a common routing protocol.

An Autonomous System may contain one or more networks, but each network within the AS may

or may not support subnetting. Every OSPF routing domain must have a “Backbone”. An OSPF

backbone distributes routing information between areas in an OSPF routing domain. The

backbone of an OSPF routing domain is an OSPF area possessing an area ID of 0.0.0.0.

Because OSPF Protocol only broadcasts link state updates when the topology has changed, it is

considered “quiet” when compared to RIP Protocol, which has to periodically send a portion, or all

of its routing table to its neighbors.

Convergence (the time it takes to recalculate routing tables) under the OSPF Protocol is

instantaneous and not periodic because of the use of IP Multicast to send the link-state updates.

Updates are only sent when routing changes occur instead of periodically, ensuring better use of

available bandwidth.

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Cabletron Systems CyberSWITCH CSX500 Specifications Page 67