Specifications

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Glossary
GL-3
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
h
E
eBGP
External Border Gateway Protocol (BGP). Operates between external systems.
EIGRP
Enhanced Interior Gateway Protocol. A Cisco routing protocol that uses the Diffusing Update
Algorithm to provide fast convergence and minimized bandwidth utilization.
F
feasible distance
The lowest calculated distance to a network destination in EIGRP. The feasibility distance is the sum
of the advertised distance from a neighbor plus the cost of the link to that neighbor.
feasible successor
Neighbors in EIGRP that advertise a shorter distance to the destination than the current feasibility
distance.
FIB
Fowarding Information Base. The forwarding table on each module that is used to make the Layer 3
forwarding decisions per packet.
G
gateway
A switch or router that forwards Layer 3 traffic from a LAN to the rest of the network.
H
hello interval
The configurable time between each Hello packet sent by an OSPF or EIGRP router.
hello packet
A special message used by OSPF or IS-IS to discover neighbors. Also acts as a keep alive messages
between established neighbors.
hold time
In BGP - Maximum time limit allowed in BGP between UPDATE or KEEPALIVE messages. If this
time is exceeded, the TCP connection between the BGP peers is closed.
In EIGRP, the maximum time allowed between EIGRP Hello messages. If this time is exceeded, the
neighbor is declared unreachable.
hop count
The number of routers that can be traversed in a route. Used by RIP.
I
iBGP
Internal Border Gateway Protocol (BGP). Operates within an autonomous system.
ICMP
IETF RFCs
Internet Engineering Task Force Request for Comments.