I see this in some notes I had from a previous lab I did... I had disabled L1 on some interfaces, and I see this as so with "show isis interface"... where I see Level 1 is Disabled.
set protocols isis interface lo0.4 level 1 disable
set protocols isis interface lt-0/1/0.34 level 1 disable
set protocols isis interface lt-0/1/0.35 level 1 disable
set protocols isis interface lt-0/1/0.3000 level 1 disable
[edit]
P-1(r4)#run show isis interface
IS-IS interface database:
Interface L CirID Level 1 DR Level 2 DR L1/L2 Metric
lo0.4 3 0x1 Passive 0/0
lt-0/1/0.3000 2 0x1 Disabled Down 10/10
lt-0/1/0.34 2 0x1 Disabled Down 10/10
lt-0/1/0.35 2 0x1 Disabled Down 10/10
------------------------------
Aaron Gould
Senior Network Engineer
aaron@gvtc.comhttps://www.linkedin.com/in/agould123/------------------------------
Original Message:
Sent: 09-23-2021 02:48
From: Unknown User
Subject: Question on ISIS Router Type
Thanks Elvin.
But why does the Attributes field say L1L2 instead of L2?
(This is more of an academic question than a practical one).
--Deepak
Original Message:
Sent: 09-22-2021 14:16
From: Unknown User
Subject: Question on ISIS Router Type
Take a look at the output there, only the section for level 2 on the link-state database (LSDB) is showing in the LSP, which means the IS is showing the LSP as level 2. Also, in the LSP information, you will see the 'Level 2' flag set.
Elvin
Original Message:
Sent: 09-22-2021 13:07
From: Unknown User
Subject: Question on ISIS Router Type
Hi.
I have an L2 ISIS router as follows:
set logical-systems R2 protocols isis level 1 disable
set logical-systems R2 protocols isis interface all
However, the router is falsely advertising himself as an L1L2 router in the attributes field of its LSP:
IS-IS level 2 link-state database:
LSP ID Sequence Checksum Lifetime Attributes
vMX-addr-0-R2.00-00 0x2 0x39e0 1098 L1 L2
Shouldn't the Attributes field say 'L2' instead of 'L1 L2' ?
Thanks,
Deepak
Juniper Business Use Only