Hi Harris My apologies, I completely missed the fact that you were using fiber PIMs - maximum MTU for these is 9018 or 9014 if you have the multi-port version:
http://www.juniper.net/techpubs/software/junos-security/junos-security10.0/junos-security-swconfig-interfaces-and-routing/interfaces-physical-properties-section.html#interfaces-mtu-section On 01/10/2010, at 8:36 PM, Harris Hui wrote: > Hi Ben, > > Looks like I can apply the MTU setting on the reth interface but cannot apply > it on the fiber modules. > > show interfaces reth4 > Physical interface: reth4, Enabled, Physical link is Up > Interface index: 132, SNMP ifIndex: 180 > Link-level type: Ethernet, MTU: 9192, Speed: 1000mbps, 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: SNMP-Traps Internal: 0x4000 > Current address: 00:10:db:ff:70:04, Hardware address: 00:10:db:ff:70:04 > Last flapped : 2010-10-01 10:24:25 UTC (00:03:48 ago) > Input rate : 264 bps (0 pps) > Output rate : 480 bps (0 pps) > > Thanks > Harris > > <graycol.gif>Ben Dale ---10/01/2010 PM 02:11:40---Hi Harris > > <ecblank.gif> > From: <ecblank.gif> > Ben Dale <bd...@comlinx.com.au> > <ecblank.gif> > To: <ecblank.gif> > Harris Hui/Hong Kong/i...@ibmhk > <ecblank.gif> > Cc: <ecblank.gif> > juniper-nsp@puck.nether.net > <ecblank.gif> > Date: <ecblank.gif> > 10/01/2010 PM 02:11 > <ecblank.gif> > Subject: <ecblank.gif> > Re: [j-nsp] J6350 Jumbo frame MTU and OSPF setting > > > > Hi Harris > > On 01/10/2010, at 3:35 PM, Harris Hui wrote: > > > I am trying to configure our J6350 fiber interface to MTU 9192 to get a > > better TCP throughput. However, I can only able to configure the MTU size > > below 1500, when I configure the MTU to 9192 and commit the changes, it > > still shows MTU 1500 on the physical interface. > > 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? > > > > Do you have any experience on using Jumbo frame MTU size on the J6350? We > > are also running OSPF across the private circuit, is JUNOS support "OSPF > > ignore-mtu" like cisco? > > 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). > > Cheers, > > Ben > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
