07-21-2008 02:37 AM - edited 03-06-2019 12:19 AM
Hi Sir,
A Catalyst 4507R is directly connected to a Cisco 10008's interface Gi1/1/0. "sh int gi1/1/0" on the C10K is as follows:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GigabitEthernet1/1/0 is up, line protocol is up
Hardware is Half-height Gigabit Ethernet MAC Controller, address is 001d.a269.8d24 (bia 001d.a269.8d24)
Description: *** Connection to Catalyst 4507R ***
Internet address is 2.1.1.67/27
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 87/255, rxload 16/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1000Mbps, 1000BaseSX, Auto-negotiation, media type is SX
output flow-control is XOFF, input flow-control is XOFF
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:05, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0
Interface GigabitEthernet1/1/0 queueing strategy: PXF Class-based
5 minute input rate 65216000 bits/sec, 44622 packets/sec
5 minute output rate 344833000 bits/sec, 47251 packets/sec
13753696 packets input, 827763454 bytes, 0 no buffer
Received 1240021 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1240015 multicast, 241410137 pause input
1510948108 packets output, 3359148857 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I notice a high number of "pause input". Please advise what to configure on the Cat4507R's port to reduce this.
Thank you.
B.Rgds,
Lim TS
07-21-2008 02:39 AM
Try turning off flowcontrol on the 4k interface.
07-21-2008 03:09 AM
Hi Ryan,
Below is "sh int" on 4507R's interface connecting to the C10K:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GigabitEthernet3/6 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 0017.958b.bf2b (bia 0017.958b.bf2b)
Description: *** Connection to Cisco 10008 Gi1/1/0 ***
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 17/255, rxload 87/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX
input flow-control is on, output flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 341837000 bits/sec, 46722 packets/sec
5 minute output rate 67001000 bits/sec, 44361 packets/sec
220485800313 packets input, 186924487300379 bytes, 0 no buffer
Received 611093 broadcasts (611087 multicasts)
0 runts, 0 giants, 0 throttles
77 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
193263552385 packets output, 36812566451171 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By disabling flow control, will it cause input error counters to increase?
Thank you.
B.Rgds,
Lim TS
07-21-2008 11:42 PM
It certainly could - it depends how much traffic you're pushing. The 4k is trying to flowcontrol the neighboring device for a reason. :) If you do see input errors, that may be an indication you're pushing too much traffic over this interface.
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