[j-nsp] L2 mismatch timeouts...
Zvezdelin Vladov
zvladov at gmail.com
Sat Mar 12 03:45:29 EST 2005
Hello Phil,
What could be the cause of those kind of malformed
or short frames?
Wouldn't they be counted as CRC/Align or whatever
other error counters are available on the LINK layer?
Why all the other L2 counters for errors are zero?
I made some tests with another pic - 4x F/E 100 BASE-TX,
and I have the same results.... L2 mismatch timeouts.
I did change the switch - from HP to Cisco 2950 I
see the same problems with both of the PICs.
The very strange thing is that on a GE IQ SFP-with SFP-LX
port I don't see anything like this. The switch in this
case is cisco 3750.
And now comes the VERY strange part -
when I turned off the VLAN tagging on the juniper -
and made the cisco switch switchport access vlan X,
[i.e. cisco adds the VLAN tag] the problem on the
Juniper disappeared!
I.e. no single L2 mismatch timeout!
Thank you,
Zvezdelin Vladov
On Fri, 11 Mar 2005 17:37:06 -0800, Phil Jolliffe <pjolliff at juniper.net> wrote:
> 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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