Chapter 18: General IP Routing
Displaying the Routing Table
– 641 –
than one of these methods, the priority for route selection is local, static,
and then dynamic (except when the distance parameter of a dynamic route
is set to a value that makes its priority exceed that of a static route). Also
note that the route for a local interface is not enabled (i.e., listed in the
routing table) unless there is at least one active link connected to that
interface.
CLI R
EFERENCES
•
C
OMMAND
U
SAGE
•
The Forwarding Information Base (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 – RIB), which holds all routing information received from routing
peers. The FIB 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 FIB entry are a network prefix,
a router (i.e., VLAN) interface, and next hop information.
•
The Routing Table (and
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. Note that routes
currently not accessible for forwarding, may still be displayed by using
the
command.
P
ARAMETERS
These parameters are displayed:
•
VLAN
– VLAN identifier (i.e., configured as a valid IP subnet).
•
Destination IP Address
– IP address of the destination network,
subnetwork, or host. Note that the address 0.0.0.0 indicates the
default gateway for this router.
•
Net Mask
– Network mask for the associated IP subnet. This mask
identifies the host address bits used for routing to specific subnets.
•
Next Hop
– The IP address of the next hop (or gateway) in this route.
•
Metric
– Cost for this interface.
•
Protocol
– The protocol which generated this route information.
(Options: Local, Static, Others)
W
EB
I
NTERFACE
To display the routing table:
Содержание SSE-G2252
Страница 42: ...44 General IP Routing on page 627...
Страница 174: ...Chapter 6 VLAN Configuration Configuring VLAN Mirroring 178 Figure 6 27 Showing the VLANs to Mirror...
Страница 511: ...Chapter 14 Basic Administration Protocols UDLD Configuration 518 Figure 14 100 Displaying UDLD Neighbor Information...
Страница 603: ...Chapter 16 IP Configuration Setting the Switch s IP Address IP Version 6 609...
Страница 883: ...Chapter 24 General Security Measures Port based Traffic Segmentation 894...
Страница 989: ...Chapter 30 Congestion Control Commands Automatic Traffic Control Commands 1000 Console...
Страница 1007: ...Chapter 33 Address Table Commands 1019...
Страница 1137: ...Chapter 38 Quality of Service Commands 1150...
Страница 1366: ...Chapter 46 IP Routing Commands Global Routing Configuration 1381 Connected 2 Total 2 FIB 0 Console...