You can configure the MTU (maximum
transmission unit) at the system level or at the physical port level for Layer 2, IPv4, and
IPv6.
About this task
Follow this procedure to configure MTU at
interface or system level.
Tip
In SLX-OS, you can use the show interface
ethernet command to see the current MTU configuration for an
interface.
You can change the MTU for one or more IP addresses or for a specified fabric.
For more configuration examples, see the
ExtremeCloud Orchestrator Command Reference,
3.2.1
.
Note
The
efa inventory device
interface set-mtu command is an operational (or exec) command, not a
configuration command. With operational commands, there is no configuration
persistence, no drift identification, and no configuration reconciliation. You run
operational commands as needed.
Procedure
-
At the interface level, run the
efa inventory device
interface set-mtu command.
This example configures the MTU on multiple IP addresses.
efa inventory device interface set-mtu --ip 10.25.225.167,10.24.48.131,
10.24.51.135 --if-name 0/20-22 --mtu 3600 --ip-mtu 3600 --ipv6-mtu 3600
+---------------+-----+------+----------------+------+--------+----------+---------
| DeviceIP | ID | Name | Interface Type | MTU | IP MTU | IPv6 MTU | Result
+---------------+-----+------+----------------+------+--------+----------+---------
| 10.25.225.167 | 9 | 0/21 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 89 | 0/20 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 1 | 0/22 | ethernet | 3600 | 3600 | 3600 | Success
+---------------+-----+------+----------------+------+--------+----------+---------
| 10.24.48.131 | 142 | 0/20 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 148 | 0/22 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 110 | 0/21 | ethernet | 3600 | 3600 | 3600 | Success
+---------------+-----+------+----------------+------+--------+----------+---------
| 10.24.51.135 | 16 | 0/21 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 48 | 0/22 | ethernet | 3600 | 3600 | 3600 | Success
+ +-----+------+----------------+------+--------+----------+---------
| | 86 | 0/20 | ethernet | 3600 | 3600 | 3600 | Success
+---------------+-----+------+----------------+------+--------+----------+---------
Interface MTU Details
--- Time Elapsed: 59.5462548s ---
This example configures the MTU for the specified fabric name.
efa inventory device interface set-mtu --fabric nc_no_vni --if-name 0/20-22,0/55-58
--mtu 3200 --ip-mtu 3200 --ipv6-mtu 3200
+-------+-----+--------+---------+-----+-----+-----+--------+--------------------------
|Device | ID | Name |Interface| MTU | IP |IPv6 | Result | Reason
|IP | | |Type | | MTU |MTU | |
+-------+-----+--------+---------+-----+-----+-----+--------+--------------------------
|10.24 | 16 | 0/21 |ethernet | 3200| 3200| 3200| Success|
|.51.135| | | | | | | |
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 48 | 0/22 |ethernet | 3200| 3200| 3200| Success|
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 86 | 0/20 |ethernet | 3200| 3200| 3200| Success|
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 0 | 0/55-58|ethernet | 0 | 0 | 0 | Failed | Interfaces [0/55-58]
| | | | | | | | | do not exist for device
| | | | | | | | | IP 10.24.51.135
| | | | | | | | | Specify a valid interface
+-------+-----+--------+---------+-----+-----+-----+--------+--------------------------
|10.24 | 0 | 0/55-58|ethernet | 0 | 0 | 0 | Failed | Interfaces [0/55-58]
|.48.131| | | | | | | | does not exist for
| | | | | | | | | device IP 10.24.51.131
| | | | | | | | | Specify a valid interface
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 110 | 0/21 |ethernet | 3200| 3200| 3200| Success|
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 148 | 0/22 |ethernet | 3200| 3200| 3200| Success|
+ +-----+--------+---------+-----+-----+-----+--------+--------------------------
| | 142 | 0/20 |ethernet | 3200| 3200| 3200| Success|
+-------+-----+--------+---------+-----+-----+-----+--------+--------------------------
Interface MTU Details
--- Time Elapsed: 37.3021602s ---
-
At the interface level, run the efa inventory device interface
unset-mtu command.
This example unsets the MTU and IP-MTU from an interface.
efa inventory device interface unset-mtu --ip 10.20.24.10 --if-name=0/6 --mtu –ip-mtu
+------------+----+------+----------+------+-----+------+--------+-------+
| DeviceIP | ID | Name | Interface| MTU | IP | IPv6 | Result | Reason|
| | ID | | Type | MTU | MTU | MTU | | |
+------------+----+------+----------+------+-----+------+--------+-------+
| 10.20.24.10| 451| 0/6 | ethernet | true | true| false| Success| |
+------------+----+------+----------+------+-----+------+--------+-------+
Interface MTU Details
--- Time Elapsed: 6.469215243s ---
Note
Drift and Reconcile does not enforce the unset-mtu setting and enables an OOB (out-of-band)
change to stay on the device.
