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CSS 11501 Runts

I have a CSS 11501 connected to a 3750 with a crossover cable. I am seeing that almost every packet that travels to the 3750 is being considered a runt. Any ideas?

3750 Interface

interface GigabitEthernet1/0/21

description Connection to CSS

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,28

switchport mode trunk

duplex full

speed 100

SWT03SRV#sh int g 1/0/21

GigabitEthernet1/0/21 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 000f.2325.4695 (bia 000f.2325.4695)

Description: Connection to CSS

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

reliability 234/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

input flow-control is off, output flow-control is off

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 never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 2000 bits/sec, 2 packets/sec

5 minute output rate 14000 bits/sec, 16 packets/sec

3780034 packets input, 513917174 bytes, 0 no buffer

Received 49995 broadcasts (0 multicast)

626300 runts, 0 giants, 0 throttles

626300 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 17613 multicast, 0 pause input

0 input packets with dribble condition detected

49231007 packets output, 688541161 bytes, 0 underruns

0 output errors, 367 collisions, 1 interface resets

0 babbles, 78 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

CSS Interface

interface e1

description "Connection to 3750-SRV"

phy 100Mbits-FD


vlan 1


vlan 28

Cisco Employee

Re: CSS 11501 Runts

there is also collision on a full duplex interface.

This is strange.

Can you get a 'sho phy e1' from the css.

Try to do adminshut/no adminshut the e1 interface on the CSS.

Finally, manually set speed and duplex mode on the catalyst.



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