Tuning and optimizing is-is networks, Configuration prerequisites, Specifying the is-is hello multiplier – H3C Technologies H3C S5560 Series Switches User Manual

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Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter IS-IS view.

isis [ process-id ] [ vpn-instance
vpn-instance-name ]

N/A

3.

Configure route

leaking from Level-1 to
Level-2.

import-route isis level-1 into level-2 [ filter-policy
{ acl-number | prefix-list prefix-list-name |

route-policy route-policy-name } | tag tag ] *

By default, IS-IS advertises
routes from Level-1 to

Level-2.

4.

Configure route
leaking from Level-2 to

Level-1.

import-route isis level-2 into level-1 [ filter-policy
{ acl-number | prefix-list prefix-list-name |
route-policy route-policy-name } | tag tag ] *

By default, IS-IS does not
advertise routes from
Level-2 to Level-1.

Tuning and optimizing IS-IS networks

Configuration prerequisites

Before you tune and optimize IS-IS networks, complete the following tasks:

Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.

Enable IS-IS.

Specifying the interval for sending IS-IS hello packets

If a neighbor does not receive any hello packets from the router within the advertised hold time, it
considers the router down and recalculates the routes. The hold time is the hello multiplier multiplied by

the hello interval.
To specify the interval for sending hello packets:

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter interface view.

interface interface-type
interface-number

N/A

3.

Specify the interval for
sending hello packets.

isis timer hello seconds [ level-1 |
level-2 ]

The default setting is 10 seconds.
The interval between hello packets
sent by the DIS is 1/3 the hello

interval set with the isis timer hello
command.

Specifying the IS-IS hello multiplier

The hello multiplier is the number of hello packets a neighbor must miss before it declares that the router
is down.
If a neighbor receives no hello packets from the router within the advertised hold time, it considers the

router down and recalculates the routes. The hold time is the hello multiplier multiplied by the hello

interval.

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