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[Junos] How to set MTU on an aggregated interface



Article ID: KB22639 KB Last Updated: 07 Mar 2012Version: 1.0
This article provides information on how to set the MTU on an aggregated interface.
For example, when setting the MTU to 9000 on two ports, which are linked to ae0, the ae child device mtu setting is not allowed message is noticed.

To set the MTU on an aggregated interface:
#set interfaces ae0 mtu 9000
Use the following command to check the MTU at ae0:
#run show interfaces ae0 extensive
Physical interface: ae0, Enabled, Physical link is Down
Interface index: 151, SNMP ifIndex: 546, Generation: 154
Link-level type: Ethernet, MTU: 9000, Speed: Unspecified, BPDU Error: None,
MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 0
Device flags : Present Running
Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
Current address: 02:00:00:00:00:fc, Hardware address: 02:00:00:00:00:fc
Last flapped : 2011-11-22 01:09:02 UTC (00:37:43 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0,
Policed discards: 0, Resource errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, MTU errors: 0,
Resource errors: 0

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