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Runts

Patrick McHenry
Level 4
Level 4

     Hi,

just installed a ASR-1002-X at a site that connects to the LAN by an Avaya 460 switch. I've set the Cisco LAN interface to 100 full and the Avaya LAN port to 100 full but, I'm getting alot of runts. From quick searches I've read that runts are usually caused by duplex mismatches but, these interfaces are set the same. We are going to be replacing these Avayas with Cisco in the near future and the errors don't seem to be affecting performance but it still kinda bothers me. I believe these errors have accumulated from the past 4 days.

Any ideas?

Thank you.  

WN-1002-WAN1#sh int g0/0/0

GigabitEthernet0/0/0 is up, line protocol is up

  Hardware is 6XGE-BUILT-IN, address is 0006.f60f.5600 (bia 0006.f60f.5600)

  Description: Wilmington Data LAN

  Internet address is 172.30.100.1/22

  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,

     reliability 255/255, txload 7/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not supported

  Full Duplex, 100Mbps, link type is force-up, media type is T

  output flow-control is on, input flow-control is on

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 4d16h

  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: Class-based queueing

  Output queue: 0/40 (size/max)

  5 minute input rate 283000 bits/sec, 209 packets/sec

  5 minute output rate 2962000 bits/sec, 341 packets/sec

     53456509 packets input, 16288114081 bytes, 0 no buffer

     Received 1666041 broadcasts (0 IP multicasts)

     129994 runts, 0 giants, 0 throttles

     129994 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 673192 multicast, 0 pause input

     65365510 packets output, 45843981487 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out

4 Replies 4

InayathUlla Sharieff
Cisco Employee
Cisco Employee

Hi Patrick,

You can see that the no. of runts and the input errors are the same. Runts are packets

that are less than 64 bytes and may be caused by excessive collisions.

You have to configure both sides (Gig interfaces) the same; what is the router/switch that

the ASR is connected to and is auto negotiation set up there also ?

Pl. also try speed 1000 and duplex full and see if the runts stop incrementing. Do the

same on both sides.

Regards

Inayath

Inayath,

Both are set to 100 full. The Avaya model is limited to 100 full.

Thank you.

Hi Partrick,

Try to use the new cable and clear the counters on the interface.

Did you happen to change the port on both the ends?

Regards

Inayath

Tried different cables as well. Both ends are set to 100 full.

The ASR-1002-X is using a gig interface that is configured to 100 full. The Avaya 460 is using a Fastethernet interface configured to 100 full.

Thank you.