I have a 3640 router with one ethernet interface (NM1E2W) and one E1 serial interface. The ethernet interface is connected to a Cisco3550-EMI switch. The ethernet port is in a Vlan which there is only a few router resides. The end-users are in different Vlans. The serial interface is a 2Mb/s interface and connected to a WAN remote office.
The input errors on the ethernet interface is relatively high as seen below. With the guidance of 'output interpreter' I have tuned the Public buffer pool. However the problem still continues. The number of ignored packets increases.
Does anyone has any idea how I can solve this problem? (the IOS version is 12.2(17a))
Ethernet0/0 is up, line protocol is up
Hardware is AmdP2, address is 0004.ddbb.96c1 (bia 0004.ddbb.96c1)
Internet address is xxx
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
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 07:44:14
Input queue: 0/150/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 39000 bits/sec, 7 packets/sec
5 minute output rate 7000 bits/sec, 5 packets/sec
743250 packets input, 143930814 bytes, 0 no buffer
Received 18529 broadcasts, 0 runts, 0 giants, 0 throttles
An ignore is a packet that your router does not understand , if you notice your ignores and input errors are thre same , they are also logged as input errors . If you are running an ip only feature set there is soem other protocol on that segment that your ethernet is receiving then ignoring and dropping , track this down and your ignores will cease
I don't think that ignored packet count are due to different protocols that came to the routers interface. I have used sniffers to see if there are any non-IP protocol packets coming to the interface and there are none.
More over the official explanation of the ignored packet counts is as follows:
Shows the number of received packets ignored by the interface because the interface hardware ran low on internal buffers. These buffers are different from the system buffers mentioned previously in the buffer description. Broadcast storms and bursts of noise can cause the ignored count to be increased.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...