Reference Guide

Term Definition
Default Gateway
The IP address of the default gateway. When the system does not have a more
specific route to a packet's destination, it sends the packet to the default gateway.
IP-Address/Mask
The IP-Address and mask of the destination network corresponding to this route.
Preference
The administrative distance associated with this route. Routes with low values are
preferred over routes with higher values.
Metric
The cost associated with this route.
via Next-Hop
The outgoing router IP address to use when forwarding trac to the next router (if
any) in the path toward the destination.
Route-
Timestamp
The last updated time for dynamic routes. The format of Route-Timestamp will be
•
Days:Hours:Minutes if days > = 1
•
Hours:Minutes:Seconds if days < 1
Interface
The outgoing router interface to use when forwarding trac to the next destination.
For reject routes, the next hop interface would be Null0 interface.
T
A flag appended to a route to indicate that it is an ECMP route, but only one of its
next hops has been installed in the forwarding table. The forwarding table may limit
the number of ECMP routes or the number of ECMP groups. When an ECMP route
cannot be installed because such a limit is reached, the route is installed with a single
next hop. Such truncated routes are identified by a T after the interface name.
To administratively control the trac destined to a particular network and prevent it from being
forwarded through the router, you can configure a static reject route on the router. Such trac would be
discarded and the ICMP destination unreachable message is sent back to the source. This is typically
used for preventing routing loops. The reject route added in the RTO is of the type OSPF Inter-Area.
Reject routes (routes of REJECT type installed by any protocol) are not redistributed by OSPF/RIP.
Reject routes are supported in both OSPFv2 and OSPFv3 (Open Shortest Path First version 3).
The following example shows CLI display output for the command.
(Extreme 220) (Routing) #show ip route
Route Codes: R - RIP Derived, O - OSPF Derived, C - Connected, S - Static
B - BGP Derived, IA - OSPF Inter Area
E1 - OSPF External Type 1, E2 - OSPF External Type 2
N1 - OSPF NSSA External Type 1, N2 - OSPF NSSA External Type 2 L-Leaked
Route K - Kernel P - Net Prototype
Default gateway is 1.1.1.2
C 1.1.1.0/24 [0/1] directly connected, 0/11
C 2.2.2.0/24 [0/1] directly connected, 0/1
C 5.5.5.0/24 [0/1] directly connected, 0/5
S 7.0.0.0/8 [1/0] directly connected, Null0
OIA 10.10.10.0/24 [110/6] via 5.5.5.2, 00h:00m:01s, 0/5
C 11.11.11.0/24 [0/1] directly connected, 0/11
S 12.0.0.0/8 [5/0] directly connected, Null0
S 23.0.0.0/8 [3/0] directly connected, Null0
C 1.1.1.0/24 [0/1] directly connected, 0/11
C 2.2.2.0/24 [0/1] directly connected, 0/1
C 5.5.5.0/24 [0/1] directly connected, 0/5
Routing Commands
ExtremeSwitching 200 Series: Command Reference Guide for version 01 .02.04.0007 523