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On a broadcast link, Level-1 and Level-2 hello packets are advertised separately and therefore you
need to set a hello multiplier for each level. On a P2P link, Level-1 and Level-2 hello packets are
advertised in P2P hello packets, and you need not specify Level-1 or Level-2.
Configuring a DIS Priority for an Interface
On an IS-IS broadcast network, a router should be elected as the DIS at a routing level. You can specify
a DIS priority at a level for an interface. The greater the interface's priority is, the more likely it becomes
the DIS. If multiple routers in the broadcast network have the same highest DIS priority, the router with
the highest MAC address becomes the DIS.
Follow these steps to specify a DIS priority for an interface:
To do...
Enter system view
Enter interface view
Specify a DIS priority for the
interface
Disabling an Interface from Sending/Receiving IS-IS Packets
After disabled from sending and receiving hello packets, an interface cannot form any neighbor
relationship, but can advertise directly connected networks in LSPs through other interfaces. By doing
so, you can save bandwidth and CPU resources while ensuring other routers know networks directly
connected to the interfaces.
Follow these steps to disable an interface from sending and receiving IS-IS packets:
To do...
Enter system view
Enter interface view
Disable the interface from sending
and receiving IS-IS packets
Enabling an Interface to Send Small Hello Packets
IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated into
frames. Therefore, any two IS-IS neighboring routers need to negotiate a common MTU. To avoid
sending big hellos for saving bandwidth, you can enable the interface to send small hello packets
without CLVs.
Follow these steps to enable an interface to send small hello packets:
Use the command...
system-view
interface interface-type interface-number
isis dis-priority value [ level-1 | level-2 ]
Use the command...
system-view
interface interface-type
interface-number
isis silent
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Remarks
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Optional
64 by default
Remarks
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Required
Not disabled by default
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Troubleshooting
