Table of Contents
Advertisement
| IP Routing Commands
C
51
HAPTER
Global Routing Configuration
C
M
OMMAND
ODE
Privileged Exec
C
U
OMMAND
SAGE
The FIB contains information required to forward IP traffic. It contains
◆
the interface identifier and next hop information for each reachable
destination network prefix based on the IP routing table. When routing
or topology changes occur in the network, the routing table is updated,
and those changes are immediately reflected in the FIB.
The FIB is distinct from the routing table (or, Routing Information
Base), which holds all routing information received from routing peers.
The forwarding information base contains unique paths only. It does
not contain any secondary paths. A FIB entry consists of the minimum
amount of information necessary to make a forwarding decision on a
particular packet. The typical components within a forwarding
information base entry are a network prefix, a router port identifier,
and next hop information.
This command only displays routes which are currently accessible for
◆
forwarding. The router must be able to directly reach the next hop, so
the VLAN interface associated with any dynamic or static route entry
must be up.
E
XAMPLE
In the following example, note that the last entry displays both the
distance and metric for this route.
Console#show ipv6 route
Codes: C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
C
::1/128, lo0
?
FE80::/64, VLAN1 inactive
C
FE80::/64, VLAN1
?
FF00::/8, VLAN1 inactive
O IA 3FFF:1::/32 [110/3]
via FE80::204:FF:FE05:6, VLAN1
Console#
– 1732 –
Advertisement
Chapters
Table of Contents
