[j-nsp] L2 mismatch timeouts...
Phil Jolliffe
pjolliff at juniper.net
Fri Mar 11 20:37:06 EST 2005
L2 mismatch timeouts is a count of malformed or short packets that cause
the incoming packet handler to discard the frame as unreadable.
Unknown L2 formats (CDP, IPX, or even inet/inet6/mpls/iso if the family
statement is not under the interface unit) show up as the policed
discard counter incrementing.
-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of daniel
Sent: Saturday, March 12, 2005 12:40 AM
To: Zvezdelin Vladov
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] L2 mismatch timeouts...
Zvezdelin,
if the link runs clean (run a rapid ping, large packet size, various
payloads to get some additional confirmation), i'd suspect the HP is
still sending some type of unsupported L2 protocol to the router.
Perhaps the switch can do port- mirroring so you can do some sniffing ?
Daniel.
On 10:26 Wed 09 Mar , Zvezdelin Vladov wrote:
> Dear All,
>
> I see L2 mismatch timeouts between m7i, 7.1R1.3, with this pic : 2x
> F/E, 100 BASE-TX and HP2524 with:
> Firmware revision : F.05.22
> ROM Version : F.02.01
>
> On the HP, I have turned off spanning tree, cdp, on the port where the
> juniper is connected.
> At the port where juniper is connected, I have only one VLAN- and this
> VLAN is turned on the juniper too.
> I have set full-duplex 100mbits both on the Juniper and the HP.
> I see no errors on the HP side, but see those L2 mismatch timeouts,
> nomatter what I do.
> I have chaned cables - with no effect.
> The port is not loaded... it doesn't go even close to 512Kbit/s.
>
> Any ideas on what might be the cause and how to fix it?
>
> Thank you,
>
> Zvezdelin Vladov
>
> P.S. Here is dump of sho interfaces fe-1/3/0 extensive
>
> Physical interface: fe-1/3/0, Enabled, Physical link is Up
> Interface index: 148, SNMP ifIndex: 75, Generation: 31
> Link-level type: Ethernet, MTU: 1518, Speed: 100mbps, Loopback:
Disabled,
> Source filtering: Disabled, Flow control: Disabled
> Device flags : Present Running
> Interface flags: SNMP-Traps 16384
> Link flags : None
> CoS queues : 4 supported
> Hold-times : Up 0 ms, Down 0 ms
> Current address: 00:12:1e:1c:24:db, Hardware address:
00:12:1e:1c:24:db
> Last flapped : 2005-03-07 18:29:32 EET (1d 15:55 ago)
> Statistics last cleared: 2005-03-09 10:01:49 EET (00:23:22 ago)
> Traffic statistics:
> Input bytes : 1299356 4168 bps
> Output bytes : 1302889 4936 bps
> Input packets: 3905 6 pps
> Output packets: 3756 4 pps
> Input errors:
> Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed
discards: 0,
> L3 incompletes: 1, L2 channel errors: 0, L2 mismatch timeouts:
> 702, 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
> Queue counters: Queued packets Transmitted packets
Dropped packets
> 0 best-effort 3716 3716
0
> 1 expedited-fo 0 0
0
> 2 assured-forw 0 0
0
> 3 network-cont 48 48
0
> Active alarms : None
> Active defects : None
> MAC statistics: Receive Transmit
> Total octets 1436592 1319553
> Total packets 4598 3755
> Unicast packets 3664 3755
> Broadcast packets 233 0
> Multicast packets 701 0
> CRC/Align errors 0 0
> FIFO errors 0 0
> MAC control frames 0 0
> MAC pause frames 0 0
> Oversized frames 0
> Jabber frames 0
> Fragment frames 0
> VLAN tagged frames 0
> Code violations 0
> Filter statistics:
> Input packet count 4598
> Input packet rejects 0
> Input DA rejects 702
> Input SA rejects 0
> Output packet count 3755
> Output packet pad count 0
> Output packet error count 0
> CAM destination filters: 1, CAM source filters: 0
> Autonegotiation information:
> Negotiation status: Incomplete
> Packet Forwarding Engine configuration:
> Destination slot: 1
> CoS transmit queue Bandwidth Buffer
> Priority Limit
> % bps % bytes
> 0 best-effort 95 95000000 95 0
> low none
> 3 network-control 5 5000000 5 0
> low none
>
> Logical interface fe-1/3/0.0 (Index 69) (SNMP ifIndex 78)
(Generation 7)
> Flags: SNMP-Traps 16384 VLAN-Tag [ 0x8100.503 ] Encapsulation:
ENET2
> Traffic statistics:
> Input bytes : 1298900
> Output bytes : 339949
> Input packets: 3899
> Output packets: 2472
> Local statistics:
> Input bytes : 1257220
> Output bytes : 339949
> Input packets: 3844
> Output packets: 2472
> Transit statistics:
> Input bytes : 41680 408 bps
> Output bytes : 0 0 bps
> Input packets: 55 1 pps
> Output packets: 0 0 pps
> Protocol inet, MTU: 1500, Generation: 14, Route table: 0
> Flags: None
> Addresses, Flags: Preferred Is-Preferred Is-Primary
> Destination: x.x.x.x, Local: x.x.x.x, Broadcast: x.x.x.x,
> Generation: 12
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