Dell Networking S4810, Reference Manual

Page: 1018 / 1761

Field Description
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 2 router and can reach other areas.
Level 1-only routers and Level 1-2 routers that have lost
connection to other Level 2 routers use the Attach bit to
find the closest Level 2 router. They point a default route to
the closest Level 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.
FTOS#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
1018
Intermediate System to Intermediate System (IS-IS)