Cisco Nexus 7000 Series - Page 517

Send document comments to nexus7k-docfeedback@cisco.com.
Glossary
GL-5
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
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.
N
NDP
Neighbor Discovery Protocol. The protocol used by IPv6 to find the MAC address associated with an
IPv6 address.
network layer
reachability
information
BGP network layer reachability information (NRLI). Contains the a list of network IP addresses and
network masks for networks that are reachable from the advertising BGP peer.
next hop
The next router that a packet is sent to on its way to the destination address.
NSSA
Not-So-Stubby-Area. Limits AS external LSAs in an OSPF area.
O
OSPF
Open Shortest Path First. An IETF link-state protocol. OSPFv2 supports IPv4 and OSPFv3 supports
IPv6.
P
path length
Sum of all link costs or the hop count that a packet experiences when routed from the source to the
destination.
policy-based
routing
The method of using route maps to alter the route selected for a packet.