Dis & Router Priority; Basic Is-Is Configuration; Figure 91 Is-Is Areas - Zte ZXR10 GER User Manual

L1/L2 router: Exists in a non-backbone area and exchanges
routing
backbone area.
IS-IS area division and router types are shown in Figure 91.
F
I G U R E
Area 20
DIS & Router Priority
Designated In a broadcast network, IS-IS protocol, similar to OSPF protocol,
Router also
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.
DIS Election 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

Purpose Refer to below procedure for IS-IS configuration on ZTE ZXR10
GER.
Prerequisite
information between
9 1 I - I A
S S R E A S
L1
A
L1/L2
D
Router
L2
L1
B
uses designated
Router Command Line Interface has been accessed.
IS-IS is running in a network.
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Chapter 15 IS-IS Configuration
non-backbone
L2
C
L1/L2
E
F
L2
Area 10
router (DIS, that
area and the
L1
G
Area 30
L1
H
is, Designated
213