I have a 1851 router connected to a 4507 switch via a LES10 circuit. The users on the 1851 router say they get intermitent packet loss over the link. Looking at it there are output and input queue drops. Anyone know what mught be causing this as the circuit is monitored over 5 min averages and is peaking at about 5 meg.
The 4507 is in layer 2 mode only and has a 6509 hanging off it for routing.
The interface on the 4507 is an access port and both ends are set to 10/full duplex.
Show Interface details below
Any advise appreciated.
Interface on Cisco 2851 Router connecting to Cisco 4507
sh int gi0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is MV96340 Ethernet, address is 0012.d974.77f8 (bia 0012.d974.77f8)
Description: Link to 4507
Internet address is *.*.*.*/29
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 5/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Mb/s, media type is T
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 1d00h
Input queue: 0/75/2/0 (size/max/drops/flushes); Total output drops: 2933
It's very easy to overwhelm a 10Mbps link. If you try to shove too much data down that pipe, you're going to overflow the queue. My best guess is that in occasional bursts, the 10Mbps link is getting saturated, and your users are experiencing the packet loss.
You might consider using Generic Traffic Shaping (GTS) to throttle the user's bandwidth to 10Mbps before it has to traverse the LES10 circuit between the switches. GTS is pretty graceful in circumstances like this, and may reduce the packet loss.
Another thought - I was unfamiliar with LES10, but after reading up on it, I'm understanding it as the 10Mbps flavor an SHDS fiber connection; British Telecom likes to call it "LES10". Is it possible to get some circuit statistics from your provider? They may be able to offer some insight into the packet loss, if my theory turns out to be wrong.
Thankyou for the above I will get in touch with our telco and see what they can offer us stats wise. Is there an IOS command to see what the peak/max unicast and multicast traffic flow was through an interface since last clear counters.
I am not aware of an IOS command that will give you the peak load since the last "clear counters". I did some poking around on a 3750 today, and came up dry. Most of what I found relating to finding traffic peaks had to do with historical analyzers. Most of these analyzers pull their data either via SNMP and/or by analyzing NetFlow data exported from the devices you've modeled.
If you are interested in some free and popular SNMP graphers, you could do worse than MRTG or Cacti. I'm sort of partial to Cacti, myself. Tidy little interface.
A commercial solution that would be a GREAT tool in your arsenal is the SolarWinds Engineer Edition (I think Windows only). It'll do a lot of wonderful things, including monitor bandwidth utilization, and graph it historically. It's powerful, and once you have it you'll wonder how you lived without it. But they don't give it away.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.