Route Summarization Between Area"S; Adjusting Ospf Timers - Avaya 8600 Engineering

Route Summarization between Area's
9.4
In this example, we wish to

Use brouter ports for all core links

Configure port based VLANs for local networks.

Configure PP8600A to add a default route pointing to the Network Core and advertise the default
route to PP8600B and PP8600C.
9.5

Adjusting OSPF Timers

By default, the OSPF timers are set as follows:

Hello Interval = 10 seconds (how often OSPF hello‟s are sent)
o
The time interval to show often OSPF hello packets are sent.

Dead Interval = 40 seconds
o
The time interval that sets the number of seconds without receiving Hello packets before
an OSPF neighbor adjacency is declared down.
o
The timer is normally set to 4 x the OSPF Hello interval

SPF (Shortest path first) Hold Down = 10 seconds
o
The interval in which the router refuses to accept updates (LSA) for a route has been
declared unreachable.
Without changing any of the default OSPF parameters, by default, it will take 40 seconds before declaring
a neighbor‟s adjacency is down. For networks that require a faster convergence, the Hello Timer can set
down to as low as 1 seconds with a dead interval of 4 seconds and a hold down of 4 seconds. On the
Ethernet Routing Switch 8600, the Hello and Dead interval are configurable on a interface level while the
hold down is an OSPF global parameter.
To change the default OSPF timer setting, the following commands are used:

To change the OSPF hello timer, enter the following command:
ERS 8600# config ip ospf interface <IP address> hello-interval <1-65535>

To change the OSPF Dead Interface, enter the following command:
November 2010
ERS 8600 / 8800 OSPF Technical Configuration Guide
avaya.com
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