Thursday, September 22, 2005

Measuring Bandwidth Utilization on Cisco Switch Ports

Yesterday I spoke at cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 third Net Optics Think Tank in Santa Clara, CA. During cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 event one of cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 Net Optics product managers asked me about measuring bandwidth utilization on switch ports. I did not have an answer for him... until I took a look at cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 latest Packet magazine. The Q305 (.pdf) edition features a tip from Aurelio DeSimone on p. 13 mentioning cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 show controllers utilization command.

If anyone knows of a similar set of information via SNMP, please let me know via a comment here.

Here is sample output:

Switch> show controllers utilization
Port Receive Utilization Transmit Utilization
Fa0/1 0 0
Fa0/2 0 0
...truncated...
Total Ports : 12
Switch Receive Bandwidth Percentage Utilization : 0
Switch Transmit Bandwidth Percentage Utilization : 0
Switch Fabric Percentage Utilization : 0

This is just cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 sort of data I would like to see for SPAN ports. You can specify cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 SPAN port in your syntax (e.g., show controllers fastecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rnet0/1 utilization) to see how much traffic it is carrying to your sensor.

The current Packet issue also features excellent articles on new modularity features of Cisco IOS and an overview of 10 GB Ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rnet and its seven (yes, seven) variants. (There appear to be more, actually.) That sort of information reminds me of my "second law of information technology," which is "complexity increases." The second law of IT is constantly fighting cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 second law of cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rmodynamics, which is "entropy increases."

4 comments:

Anonymous said...

...measuring bandwidth utilization on switch ports

I don't know about switch ports, but back in '95/'96 when I was doing my master's cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365sis, I collected SNMP data from routers using octets-in and octets-out from cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 standard MIBII. Plotting those over time gave me utilitzation quite nicely.

H. Carvey
"Windows Forensics and Incident Recovery"
http://www.windows-ir.com
http://windowsir.blogspot.com

Anonymous said...

On layer 3 switches such as cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 3550 series, "show int summ" shows you cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 same data that is used for updating cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 inbound and outbound octets stats in mib2. Show int summ also works on just about every IOS router.

The OID that can be used from a 3550 switch (as an example, should be cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 same for a 3548/3524/etc) for octets in/out:

Inbound:
1.3.6.1.2.1.2.2.1.10.x
Outbound:
1.3.6.1.2.1.2.2.1.16.x

The x is where cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 ifIndex id goes for that particular interface. A mibwalker will help you find this.

And of course tools like MRTG, RTG, Cacti, etc make it all nice and easy to produce historical graphs.

Richard Bejtlich said...

When I posted cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 original story I did not make it clear that I was most interested in measures of backplane performance, perhaps best represented by cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 "Switch Fabric Percentage Utilization" figures. Does that make sense?

Anonymous said...

Check cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 Cisco MIB explorer online. A good place to start is:
http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=1.3.6.1.4.1.9