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
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
Extreme Fabric Automation Command Reference,
3.1.0
.
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.
