CLI Guide

Usage
Information
The following describes the show isis database command shown in the following example.
Field Description
IS-IS Level-1/
Level-2 Link
State Database
Displays the IS-IS link state database for Level 1 or Level 2.
LSPID
Displays the LSP identifier.
The first six octets are the System ID of the originating router.
The first six octets are the System ID of the originating router. The next octet is
the pseudonode ID. If this byte is not zero, the LSP describes system links. If this
byte is zero (0), the LSP describes the state of the originating router.
The designated router for a LAN creates and floods a pseudonode LSP and
describes the attached systems.
The last octet is the LSP number. An LSP is divided into multiple LSP fragments if
there is more data than cannot fit in a single LSP. Each fragment has a unique LSP
number.
An * after the LSPID indicates that the system originates an LSP where this
command was issued.
LSP Seq Num This value is the sequence number for the LSP that allows other systems to
determine if they have received the latest information from the source.
LSP Checksum This is the checksum of the entire LSP packet.
LSP Holdtime This value is the amount of time, in seconds, that the LSP remains valid. A zero
holdtime indicates that this is a purged LSP and is being removed from the link
state database. A value between brackets indicates the duration that the purged
LSP stays in the database before being removed.
ATT This value represents the Attach bit. This value indicates that the router is a Level
1-2 router and can reach other areas. Level 1-only routers and Level 1-2 routers
that have lost connection to other Level 1-2 routers use the Attach bit to find the
closest Level 1-2 router. They install a default route to the closest Level 1-2 router.
P This value represents the P bit. This bit is always set to zero as Dell EMC
Networking does not support area partition repair.
OL This value represents the overload bit, determining congestion. If the overload bit
is set, other routers do not use this system as a transit router when calculating
routes.
Example
The bold sections identify that MultiTopology IS-IS is enabled.
DellEMC# show isis database
IS-IS Level-1 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
ISIS.00-00 * 0x00000006 0xCF43 580 0/0/0
IS-IS Level-2 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
ISIS.00-00 * 0x00000006 0xCF43 580 0/0/0
!
DellEMC# show isis database detail ISIS.00-00
IS-IS Level-1 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
ISIS.00-00 * 0x0000002B 0x853B 1075 0/0/0
Area Address: 49.0000.0001
NLPID: 0xCC 0x8E
IP Address: 10.1.1.1
IPv6 Address: 1011::1
Topology: IPv4 (0x00) IPv6 (0x8002)
Metric: 10 IS OSPF.00
Intermediate System to Intermediate System (IS-IS) 847