Administrator Guide
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 identier.
The rst six octets are the System ID of the originating router.
The rst 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 oods 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 t 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 nd 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 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.
Dell# 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
!
Dell# 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
898 Intermediate System to Intermediate System (IS-IS)