09-25-2008 07:47 AM - edited 03-06-2019 01:35 AM
Hi All,
i have router that shows
sh int vlan90
Vlan90 is up, line protocol is up
Hardware is Cat6k RP Virtual Ethernet, address is 000b.bfcd.40fc (bia 000b.bfcd.40fc)
Description: server back-up network
Internet address is 10.20.90.251/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 3/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 00:04:30
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 2d19h
Input queue: 1/75/16831372/16557170 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 13498000 bits/sec, 2705 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
254887886 packets input, 152447435528 bytes, 0 no buffer
Received 271539036 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
can someone explain me what are input drops,why we have large number of input drops,what are output drops ?
why output drops are 0?
many thanks
mahesh
Solved! Go to Solution.
09-25-2008 03:30 PM
Correct.. You might also want to set the "load-interval 30" under interface vlan 90 so that you get a more accurate snap shot rather than 5 minute average
09-25-2008 09:21 AM
Your switch is seeing too much traffic coming into VLAN 90 which is not being hardware switched which is filling up input queue and hence seeing drops. You might want to see whats going on in VLAN 90.
Here is a document written for routers and does not directly apply to switches(which forward traffic in hardware asics) but should give you an idea
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml
09-25-2008 10:05 AM
Hi,
thanks for reply.
how do you figure this out that traffic is not hardware switched?
So when input queue is filled we see input
drops?in this case output drops are zero
right.
09-25-2008 11:40 AM
When input queue is filled and not cleared, we would see input
drops. If traffic is hardware switched, you should not see any input rate(but for control traffic) but you are seeing about 15 Mbps. Yes there are no output drops in your interface.
09-25-2008 11:49 AM
Hi,
thanks for eply again.
with input rare u eman this ??????
5 minute input rate 20476000 bits/sec, 3983 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
Many thanks again
09-25-2008 03:30 PM
Correct.. You might also want to set the "load-interval 30" under interface vlan 90 so that you get a more accurate snap shot rather than 5 minute average
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