The show ip mtu command can be used to see if there is space available for the ip_default_mtu_24 value in the system, or if the MTU
value is already congured in the IP table. The following shows an example output of the show ip mtu command.
device(config-tnif-10)#show ip mtu
idx size usage ref-count
0 10218 1 default
1 800 0 1
2 900 0 1
3 750 0 1
4 10194 1 1
5 10198 0 1
Syntax:show ip mtu
Clearing GRE statistics
Use the clear ip tunnel command to clear statistics related to GRE tunnels.
To clear GRE tunnel statistics, enter a command such as the following.
device(config)# clear ip tunnel stat 3
To reset a
dynamically-congured MTU on a tunnel Interface back to the congured value, enter a command such as the following.
device(config)#clear ip tunnel pmtud 3
Syntax: clear ip tunnel { pmtud tunnel-ID | stat tunnel-ID }
Use the pmtud option to reset a dynamically-congured MTU on a tunnel Interface back to the congured value.
Use the stat option to clear tunnel statistics.
The tunnel-ID variable is a valid tunnel number or name.
Use the clear statistics tunnel command to clear GRE tunnel statistics for a specic tunnel ID number. To clear GRE tunnel statistics for
tunnel ID 3, enter a command such as the following.
device(config)# clear statistics tunnel 3
Syntax: clear statistics tunnel [ tunnel-ID ]
The tunnel-ID variable
species the tunnel ID number.
Bandwidth for IP interfaces
The bandwidth for an IP interface can be specied so that higher level protocols, such as OSPFv2 and OSPFv3, can use this setting to
inuence the routing cost for routes learned on these interfaces.
When the interface bandwidth is congured, the number of network and router link state advertisement generation is reduced during an
operation down or a shutdown of one or more of the associated interfaces of the VE interface. For OSPF, when the dynamic cost feature
is enabled, the bandwidth for a VE interface is the sum of bandwidth for either all associated ports or all active associated ports. However,
when the interface bandwidth is congured on the VE interface itself, the bandwidth of the associated ports are not used in the OSPF
cost calculation. This means that even when one of the associated ports of the VE interface goes down, there is no OSPF cost
recalculation.
The bandwidth for IP interfaces feature can be congured for a physical interface, Link aggregation (LAG) groups, a VE interface, and a
tunnel interface.
Bandwidth for IP interfaces
FastIron Ethernet Switch Layer 3 Routing
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