I am having an issue pinpointing why my 2821 router is discarding so many packets when transferring data to our second site. The traffic flows from the local lan, to the router, where it is redirected via WCCP to a WAN optimization device, back to the router and over a GRE tunnel to the second site where the same process happens. The traffic does get there, but the LAN/Repeater router interfaces have around 20,000-60,000 input drops an hour. From the output below, it looks like traffic is being dropped by the RP, but I'm not sure why.
I just restarted the router as a last resort, and here is what has accumulated in the last 30 min:
FastEthernet0/0/1 is up, line protocol is up
Hardware is Fast Ethernet, address is 0025.840c.7680 (bia 0025.840c.7680)
Description: REPEATER
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 99/255, rxload 94/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s
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: 0/75/40341/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 37049000 bits/sec, 5810 packets/sec
5 minute output rate 38928000 bits/sec, 5909 packets/sec
12324124 packets input, 855031048 bytes, 0 no buffer
Received 211 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
12912889 packets output, 1892021583 bytes, 0 underruns
0 output errors, 0 collisions, 2 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
ROUTER#show int fa0/0/1 switching | i Drops
Drops RP 41172 SP 0
SPD Priority Inputs 0 Drops 0
And the interface is an access interface to VLAN10, so I'm not sure if this is normal:
FastEthernet0/0/1
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 12729585 1202817196 13308563 2202992366
Route cache 0 0 0 0
Total 12729585 1202817196 13308563 2202992366
Vlan10
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 682 91136 492 86741
Route cache 13039220 1439804318 13686842 2420832659
Total 13039902 1439895454 13687334 2420919400
And CPU never goes above 40%
100
90
80
70
60
50
40 **** *************** ***** *****
30 ************************************************************
20 ************************************************************
10 ************************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)
3343344334333334343333344334334432222221 22122 1
982990088079788082987890096189014653234940181655467474453743
100
90
80
70
60
50
40 *##*########***####**#*#*#*#*###
30 #################################** *
20 #######################################* **### *
10 ######################################## #####** ** * * *
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
Hopefully someone can help me with this, thanks!
