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# Configure Router C.
<RouterC> system-view
[RouterC] isis 1
[RouterC-isis-1] network-entity 10.0000.0000.0003.00
[RouterC-isis-1] quit
[RouterC] interface ethernet 1/1
[RouterC-Ethernet1/1] isis enable 1
[RouterC-Ethernet1/1] quit
[RouterC] interface ethernet 1/2
[RouterC-Ethernet1/2] isis enable 1
[RouterC-Ethernet1/2] quit
[RouterC] interface ethernet 1/3
[RouterC-Ethernet1/3] isis enable 1
[RouterC-Ethernet1/3] quit
# Configure Router D.
<RouterD> system-view
[RouterD] isis 1
[RouterD-isis-1] network-entity 20.0000.0000.0001.00
[RouterD-isis-1] quit
[RouterD] interface ethernet 1/1
[RouterD-Ethernet1/1] isis enable 1
[RouterD-Ethernet1/1] quit
3. Configure neighbor relationship authentication between neighbors:
# Configure the authentication mode as MD5 and set the plaintext password to eRq on Ethernet
1/1 of Router A and on Ethernet 1/3 of Router C.
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] isis authentication-mode md5 plain eRg
[RouterA-Ethernet1/1] quit
[RouterC] interface ethernet 1/3
[RouterC-Ethernet1/3] isis authentication-mode md5 plain eRg
[RouterC-Ethernet1/3] quit
# Configure the authentication mode as MD5 and set the plaintext password t5Hr on Ethernet 1/1
of Router B and on Ethernet 1/1 of Router C.
[RouterB] interface ethernet 1/1
[RouterB-Ethernet1/1] isis authentication-mode md5 plain t5Hr
[RouterB-Ethernet1/1] quit
[RouterC] interface ethernet 1/1
[RouterC-Ethernet1/1] isis authentication-mode md5 plain t5Hr
[RouterC-Ethernet1/1] quit
# Configure the authentication mode as MD5 and set the plaintext password hSec on Ethernet 1/1
of Router D and on Ethernet 1/2 of Router C.
[RouterC] interface ethernet 1/2
[RouterC-Ethernet1/2] isis authentication-mode md5 plain hSec
[RouterC-Ethernet1/2] quit
[RouterD] interface ethernet 1/1
[RouterD-Ethernet1/1] isis authentication-mode md5 plain hSec
[RouterD-Ethernet1/1] quit
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