Zte ZXR10 GER, Руководство пользователя

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Chapter 15 IS-IS Configuration
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L1/L2 router: Exists in a non-backbone area and exchanges
routing information between non-backbone area and the
backbone area.
IS-IS area division and router types are shown in Figure 91.
F
I G U R E
9 1 I
S
- I
S
A
R E A S
Area 10
Area 20
Area 30
L2
L2 L2
L1/L2
L1
L1
L1/L2
L1
L1
A
Router
B
C
D
E F
G
H
DIS & Router Priority
In a broadcast network, IS-IS protocol, similar to OSPF protocol,
also uses designated router (DIS, that is, Designated
Intermediate System). The DIS is responsible for advertising
network information to all routers on the broadcast network and
meanwhile all other routers only advertise one adjacency to the
DIS.
The router priority parameters can be IS-IS configured for DIS
election, and L1 and L2 can be independently IS-IS configured
with different priorities. Upon DIS election, a highest priority
router plays the role of DIS.
If priorities are same, for a frame relay interface, a router with
higher system ID will be elected as the DIS; while for an
Ethernet interface, a router with higher interface MAC value will
be elected as the DIS.
Basic IS-IS Configuration
Refer to below procedure for IS-IS configuration on ZTE ZXR10
GER.
„
Router Command Line Interface has been accessed.
„
IS-IS is running in a network.
Designated
Router
DIS Election
Purpose
Prerequisite