03-30-2014 09:34 PM - edited 03-04-2019 10:41 PM
Hi all,
I see ""misses in cache" keep increasing for Gi0/1 when using "show buffer".
Yet, no increasing of "no buffer" when using "show int gi0/0".
Also, no "cache misses" when using "show int gi0/1 switching"
-------------------------------------------------------
Router#show buffer
Private particle pools:
GigabitEthernet0/0 buffers, 1664 bytes (total 768, permanent 768):
0 in free list (0 min, 768 max allowed)
768 hits, 0 fallbacks
768 max cache size, 512 in cache
3600120405 hits in cache, 0 misses in cache
GigabitEthernet0/1 buffers, 1664 bytes (total 768, permanent 768):
0 in free list (0 min, 768 max allowed)
768 hits, 0 fallbacks
768 max cache size, 512 in cache
2726795893 hits in cache, 200441 misses in cache
---------------------------------------------------------------------
Router# sh int gi0/1 | be rate
Queueing strategy: fifo
Output queue: 0/768 (size/max)
30 second input rate 4693000 bits/sec, 1611 packets/sec
30 second output rate 2979000 bits/sec, 1539 packets/sec
254675070 packets input, 95687414119 bytes, 0 no buffer
Received 219458 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 215127 multicast, 0 pause input
248063195 packets output, 69304150380 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
4320 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
-------------------------------------------------------------------------
Router#sh int gi0/1 switching
GigabitEthernet0/1 ## To Customer LAN ##
Throttle count 1
Drops RP 1 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 0 Drops 0
Protocol IP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 4942282 351308330 3318353 251134393
Cache misses 0 - - -
Fast 2723729330 1182856208773 2588069178 720679718936
Auton/SSE 0 0 0 0
Protocol DEC MOP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 0 0 3501 269577
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol ARP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 61525 3691500 26317 1579020
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 35024 17161760 210174 12610440
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
--------------------------------------------------------------------------------------
BTW,what is the meaning of "Throttle" when using "sh int [interface] switching"
Router# sh int gi0/0 switching
GigabitEthernet0/0 ## To ##
Throttle count 767
Drops RP 1132 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 1 Drops 0
Thanks a lot in advance.
03-31-2014 06:51 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Unsure same applies to interface cache buffers, but in documentation for router buffers, a buffer cache miss just means a buffer needed to allocated. No buffer should indicate a packet drop as a buffer was not immediately availalble (a hit miss) or couldn't be allocated at all (a cache miss). I.e. other then perhaps slower perforamnce, waiting for a buffer allocation, not something to be worried about.
Re: throttle
https://learningnetwork.cisco.com/thread/55975
https://supportforums.cisco.com/discussion/9522611/throttles-ethernet
04-01-2014 03:16 AM
Thanks for the information, Joseph.
This is a WAN router and it only has one WAN interface and one LAN interface. What goes in the WAN , must go out from the LAN and vice versa.
But why only Gi0/1(LAN interface) keep increasing "misses in cache", yet Gi(0/0) doesn't?
And is there a way to tune the buffer of the interface ?
Thanks in advance.
04-01-2014 03:16 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Although you note you have just a single LAN and WAN interface, my guess would be cache misses might be caused by microbursts.
I don't know of a away to "tune" interface buffers.
If you believe this is an issue, contact TAC.
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