small, medium large buffers in Cisco routers

[s.muhammadi]

In one of my wan router I am seeing large number of packet drops in "large Bufers (size-5024 bytes). Almost all interfaces on this router uses a MTU of 1500. If none of the interface are going to receive a packet of more than 1500 bytes then why am i seeing this buffer drops?

I am not sure if understand correctly how a Cisco router uses various buffers (small, medium etc.) when it has to buffer packets. Is it use buffer based on packet size? Like if rotuer interface receives a packet of 610 bytes is it going to use medium buffer (size 600) or bug buffer (size 1536)?

Thanks

[amaldonado]

Check up configured MTU with show interface command. A nice paper about buffers is available at:

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a7b80.shtml

Hope this helps,

Ariel