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<p>Hi Ben,<br>
<br>
Looks like I can apply the MTU setting on the reth interface but cannot apply it on the fiber modules.<br>
<br>
show interfaces reth4 <br>
Physical interface: reth4, Enabled, Physical link is Up<br>
Interface index: 132, SNMP ifIndex: 180<br>
Link-level type: Ethernet, MTU: 9192, Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled,<br>
Source filtering: Disabled, Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 0<br>
Device flags : Present Running<br>
Interface flags: SNMP-Traps Internal: 0x4000<br>
Current address: 00:10:db:ff:70:04, Hardware address: 00:10:db:ff:70:04<br>
Last flapped : 2010-10-01 10:24:25 UTC (00:03:48 ago)<br>
Input rate : 264 bps (0 pps)<br>
Output rate : 480 bps (0 pps)<br>
<br>
Thanks<br>
Harris<br>
<br>
<img width="16" height="16" src="cid:1__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt="Inactive hide details for Ben Dale ---10/01/2010 PM 02:11:40---Hi Harris"><font color="#424282">Ben Dale ---10/01/2010 PM 02:11:40---Hi Harris</font><br>
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<font size="2" color="#5F5F5F">From:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2">Ben Dale <bdale@comlinx.com.au></font></td></tr>
<tr valign="top"><td width="1%"><img width="96" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2" color="#5F5F5F">To:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2">Harris Hui/Hong Kong/IBM@IBMHK</font></td></tr>
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<font size="2" color="#5F5F5F">Cc:</font></td><td width="100%" valign="middle"><img width="1" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2">juniper-nsp@puck.nether.net</font></td></tr>
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<font size="2" color="#5F5F5F">Date:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2">10/01/2010 PM 02:11</font></td></tr>
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<font size="2" color="#5F5F5F">Subject:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=C7BBFD3CDFA999D48f9e8a93df93@hk1.ibm.com" border="0" alt=""><br>
<font size="2">Re: [j-nsp] J6350 Jumbo frame MTU and OSPF setting</font></td></tr>
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<tt>Hi Harris<br>
<br>
On 01/10/2010, at 3:35 PM, Harris Hui wrote:<br>
<br>
> I am trying to configure our J6350 fiber interface to MTU 9192 to get a<br>
> better TCP throughput. However, I can only able to configure the MTU size<br>
> below 1500, when I configure the MTU to 9192 and commit the changes, it<br>
> still shows MTU 1500 on the physical interface.<br>
<br>
I've only got a 2320 in front of me right now, but your configuration below works fine (and the MTU changes) - what version of JUNOS are you running?<br>
<br>
<br>
> Do you have any experience on using Jumbo frame MTU size on the J6350? We<br>
> are also running OSPF across the private circuit, is JUNOS support "OSPF<br>
> ignore-mtu" like cisco?<br>
<br>
No and we've been bitten by this before - I have raised an ER with my SE regarding this, but who knows how far away that will be. You shouldn't need to use it if you control the routers on both ends (and the issue you are having with MTU goes away).<br>
<br>
Cheers,<br>
<br>
Ben</tt><br>
<br>
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