Specifications

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Glossary
GL-4
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
IGP
Interior gateway protocol. Used between routers within the same autonomous system.
instance
An independent, configurable entity, typically a protocol.
IP tunnels
IPv4
Internet Protocol version 4.
K
keepalive
A special message sent between routing peers to verify and maintain communications between the pair.
L
link cost
An arbitrary number configured on an OSPF interface which is in shortest path first calculations.
link-state
Shares information about a link, link cost to neighboring routers.
link-state
advertisement
See LSA.
LSA
Link-state advertisement. An OSPF message to share information on the operational state of a link, link
cost, and other OSPF neighbor information.
link-state database
OSPF database of all LSAs received. OSPF uses this database to calculate the best path to each
destination in the network.
link-state refresh
The time that OSPF floods the network with LSAs to ensure all OSPF routers have the same
information.
load
The degree to which a network resource, such as a router, is busy.
load balancing
The distribution of network traffic across multiple paths to a given destination.
M
message digest
A one-way hash applied to a message using a shared password and appended to the message to
authenticate the message and ensure the message has not been altered in transit.
metric
A standard of measurement, such as the path bandwidth, that is used by routing algorithms to determine
the optimal path to a destination.
MD5 authentication
digest
A cryptographic construction that is calculated based on an authentication key and the original message
and sent along with the message to the destination. Allows the destination to determine the authenticity
of the sender and guarantees that the message has not been tampered with during transmission.
MTU
Maximum transmission unit. The largest packet size that a network link will transmit without
fragmentation.