Running the command on the router and its display information is as follows:
<RTC>displisis lsdb level-2 verbose
Database information for ISIS(1)
--------------------------------
Level-2 Link State Database
LSPID Se Num Checksum Holdtime Length ATT/P/OL
-------------------------------------------------- -----------------------------
1111.1111.1111.00-00 0x00000084 0xb5cc 511 62 0/0/0
SOURCE 1111.1111.1111.00
NLPID IPV4
AREA ADDR 01
INTF ADDR 10.1.2.1
INTF ADDR 10.1.3.1
INTF ADDR 172.16.3.1
NBR ID 3333.3333.3333.00 COST: 10
1111.1111.1111.00-01 0x0000009f 0xd4f3 1195 101 0/0/0
SOURCE 1111.1111.1111.00
IP-Internal 10.2.4.0 255.255.255.252 COST: 20
IP-Internal 192.168.18.0 255.255.255.0 COST: 20
IP-Internal 10.1.2.0 255.255.255.252 COST: 10
IP-Internal 10.1.3.0 255.255.255.252 COST: 10
IP-Internal 172.16.3.1 255.255.255.255 COST: 0
IP-Internal 172.16.0.0 255.255.252.0 COST: 10
3333.3333.3333.00-00* 0x0000007c 0x2425 640 58 0/0/0
SOURCE 3333.3333.3333.00
NLPID IPV4
AREA ADDR 02
INTF ADDR 10.1.3.2
INTF ADDR 10.3.4.1
NBR ID 1111.1111.1111.00 COST: 10
3333.3333.3333.00-01* 0x00000099 0x342d 640 77 0/0/0
SOURCE 3333.3333.3333.00
IP-Internal 10.1.3.0 255.255.255.252 COST: 10
IP-Internal 10.3.4.0 255.255.255.252 COST: 10
IP-Internal 10.2.4.0 255.255.255.252 COST: 20
IP-Internal 172.16.4.1 255.255.255.255 COST: 10
*-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload
From the above information, we can know that __________.