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Configuring a DIS priority for an interface
On a broadcast network, IS-IS must elect a router 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, 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.
To configure a DIS priority for an interface:
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Configure a DIS priority for
the interface.
isis dis-priority
priority [
level-1
|
level-2
]
The default setting is 64.
Disabling an interface from sending/receiving IS-IS packets
After being 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. This can save bandwidth and CPU resources, and ensures that other routers know
networks directly connected to the interface.
To disable an interface from sending and receiving IS-IS packets:
1. Enter system view.
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Disable the interface from
sending and receiving IS-IS
packets.
isis silent
By default, the interface can send
and receive 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 in
frames. Any two IS-IS neighboring routers must negotiate a common MTU. To avoid sending big
hellos to save bandwidth, enable the interface to send small hello packets without CLVs.
To enable an interface to send small hello packets:
1. Enter system view.
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Enable the interface to send
small hello packets without
CLVs.
isis small-hello
By default, the interface can send
standard hello packets.
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