Thx David, PR587266 seems to be related to "maximum-packet-lenght" command that is not present in my config. Biggest problem in this case are dropped packet on interface: Physical interface: xe-10/0/1, Enabled, Physical link is Up Interface index: 363, SNMP ifIndex: 645, Generation: 483 Description: No Description Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps, Loopback: None, Source filtering: Disabled, Flow control: Enabled Device flags : Present Running Interface flags: SNMP-Traps Internal: 0x4000 Link flags : None CoS queues : 8 supported, 8 maximum usable queues Hold-times : Up 0 ms, Down 0 ms Current address: 00:24:dc:49:be:73, Hardware address: 00:24:dc:49:be:73 Last flapped : 2011-10-27 03:11:07 UTC (1w5d 12:18 ago) Statistics last cleared: 2011-11-08 13:15:03 UTC (02:14:38 ago) Traffic statistics: Input bytes : 4674308593808 5182909688 bps Output bytes : 6092283580895 6656998280 bps Input packets: 8393093736 1149495 pps Output packets: 6971170539 941600 pps IPv6 transit statistics: Input bytes : 23569859 Output bytes : 0 Input packets: 197870 Output packets: 0 Dropped traffic statistics due to STP State: Input bytes : 0 Output bytes : 0 Input packets: 0 Output packets: 0 Input errors: Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0 Output errors: Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0 Egress queues: 8 supported, 8 in use Queue counters: Queued packets Transmitted packets Dropped packets 0 be 6973872756 6887958719 85914037 1 ef 25695717 25695717 0 2 ef1 2062122 2062122 0 3 ef2 21430966 21430966 0 4 af 2605818 2605818 0 5 af1 1577987 1577987 0 6 nc 5928647 5928647 0 7 nc1 24705296 24705296 0 I'm wondering if is something related to CoS that is managed in different way from the two type of linecard. Regards Antonio Ferretti Network Engineer Telecom Italia Sparkle TIS.AD.NDO.O Backbone IP&Data Operations Seabone 2nd Level Support Via di Macchia Palocco, 223 00125 Roma, Italia -----Messaggio originale----- Da: david.roy@orange.com [mailto:david.roy@orange.com] Inviato: martedì 8 novembre 2011 16.13 A: Ferretti Antonio; nanog@nanog.org Oggetto: RE: Juniper MX960 Mqchip packet lenght error Hi, See the PR587266. Maybe you have Syslog/log statement in a FW filter term. Regards David David Roy Orange - IP Domestic Backbone - TAC Tel. +33(0)299876472 Mob. +33(0)685522213 Email. david.roy@orange.com Skype : davidroy.35 JNCIE-SP #703 Guest Haiku : IS-IS screams, BGP peers are flapping: I want my mommy! -----Message d'origine----- De : Ferretti Antonio [mailto:antonio.ferretti@telecomitalia.it] Envoyé : mardi 8 novembre 2011 15:35 À : nanog@nanog.org Objet : Juniper MX960 Mqchip packet lenght error Hi all, After upgrading Juniper MX960 from 4x10Gbe DPCE to 16x10Gbe MPC, I see strange log messages like this: Fpc10 MQCHIP(0) LI Packet length error, pt entry 22 Seems to be only a "cosmetic" message, but today my team found some traffic dropped on interface on this card (before we only request check about log message). Has anyone the same problem? My software release is Junos 10.3R3.7. Thanks in advance. 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