167 
4.  Configure the area authentication mode as MD5 and set the plaintext password to 10Sec on 
Router A, Router B, and Router C. 
[RouterA] isis 1 
[RouterA-isis-1] area-authentication-mode md5 plain 10Sec 
[RouterA-isis-1] quit 
[RouterB] isis 1 
[RouterB-isis-1] area-authentication-mode md5 plain 10Sec 
[RouterB-isis-1] quit 
[RouterC] isis 1 
[RouterC-isis-1] area-authentication-mode md5 plain 10Sec 
[RouterC-isis-1] quit 
5.  Configure routing domain authentication mode as MD5 and set the plaintext password to 
1020Sec on Router C and Router D. 
[RouterC] isis 1 
[RouterC-isis-1] domain-authentication-mode md5 plain 1020Sec 
[RouterC-isis-1] quit 
[RouterD] isis 1 
[RouterD-isis-1] domain-authentication-mode md5 plain 1020Sec 
IS-IS GR configuration example 
Network requirements 
As shown in Figure 44, Router A, Router B, and Router C belong to the same IS-IS routing domain. Run 
IS-IS on all the routers to interconnect them with each other. 
Figure 44 Network diagram 
 
 
Configuration procedure 
1.  Configure the IP addresses and subnet masks for interfaces on the routers. (Details not shown.) 
2.  Configure IS-IS on the routers to make sure Router A, Router B, and Router C can communicate with 
each other at Layer 3 and dynamic route update can be implemented among them with IS-IS. 
(Details not shown.) 
3.  Enable IS-IS GR on Router A. 
<RouterA> system-view 
[RouterA] isis 1 
[RouterA-isis-1] graceful-restart 
[RouterA-isis-1] return