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[Junos] How to set MTU on an aggregated interface

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Article ID: KB22639 KB Last Updated: 07 Mar 2012Version: 1.0
Summary:
This article provides information on how to set the MTU on an aggregated interface.
Symptoms:
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.
Cause:

Solution:
To set the MTU on an aggregated interface:
#set interfaces ae0 mtu 9000
#commit
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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