1-2% packet loss when ping through 7206 internal interface

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Jun 12th, 2008
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Cisco 7206VXR (NPE-G2) processor (revision A) with 917504K/65536K bytes of memory.

Processor board ID 26813841

MPC7448 CPU at 1666Mhz, Implementation 0, Rev 2.1

6 slot VXR midplane, Version 2.6

Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)


GigabitEthernet0/1 is up, line protocol is up

Hardware is MV64460 Internal MAC, address is 0004.9bb6.e81b (bia 0004.9bb6.e81b)

Description: link til for-bb-001, vlan 4 til mol-rs-001

Internet address is 82.117.32.129/25

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 10/255, rxload 80/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is RJ45

output flow-control is XON, input flow-control is XON

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 1w0d

Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 314232000 bits/sec, 36539 packets/sec

5 minute output rate 42696000 bits/sec, 20802 packets/sec

1336968110 packets input, 3794034391 bytes, 0 no buffer

Received 209780 broadcasts, 0 runts, 0 giants, 0 throttles

1 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored

0 watchdog, 888112 multicast, 0 pause input

0 input packets with dribble condition detected

1694000792 packets output, 4050007583 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 pause output

0 output buffer failures, 0 output buffers swapped out


------------------ show process cpu ------------------



CPU utilization for five seconds: 28%/28%; one minute: 30%; five minutes: 30%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

1 4 82 48 0.00% 0.00% 0.00% 0 Chunk Manager

2 28888 3186199 9 0.08% 0.01% 0.00% 0 Load Meter

4 0 1 0 0.00% 0.00% 0.00% 0 EDDRI_MAIN

5 136108472 7065868 19262 0.00% 0.39% 0.57% 0 Check heaps

6 4016 31079 129 0.00% 0.00% 0.00% 0 Pool Manager

7 0 2 0 0.00% 0.00% 0.00% 0 Timers

8 0 2 0 0.00% 0.00% 0.00% 0 ATM AutoVC Perio

9 0 2 0 0.00% 0.00% 0.00% 0 ATM VC Auto Crea

10 2796 265169 10 0.00% 0.00% 0.00% 0 IPC Dynamic Cach


This is what happens. When I send i.e. 500 ping packets inside my network, not going through the router -> no packet loss. Everytime I go through that interface, I get 1-2% ping packet loss.


I am lost for ideas. I thought it might be a buffer problem, but they look ok. Could it be that there are just to many packets for the interface to handle?!


- Morten

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paolo bevilacqua Thu, 06/12/2008 - 04:49
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Hi, the interface is significantly loaded, but not excessively yet. Packets could be lost on another link beyond the 7200, you should do aimed pings to track where exactly it happens.


Also note that ping reply is a low priority task for routers, so it is normal that some reply is lost when pinging busy routers.

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