Exceeding bandwidth points: what hapens

[sjuneau]

I have a 7204 router and I wonder what happen if the amount of bandwidth points allowed are exceeded?

Thank you in advance

[Georg Pauwen]

Hello,

if traffic exceeds the bandwidth, it depends on the queuing strategy what happens to the traffic. Do you have anything configured (CBWFQ, LLQ) on your router ? If you execute the ´show interfaces´ command it will show you the queuing strategy for that interface:

Serial0 is down, line protocol is down

Hardware is QUICC Serial

Internet address is 135.13.23.2/30

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation FRAME-RELAY, loopback not set

Keepalive set (10 sec)

LMI enq sent 2412, LMI stat recvd 2412, LMI upd recvd 0, DTE LMI down

LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0

LMI DLCI 1023 LMI type is CISCO frame relay DTE

FR SVC disabled, LAPF state down

Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0

Last input 05:32:48, output 05:32:48, output hang never

Last clearing of "show interface" counters 12:14:51

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

-->Queueing strategy: weighted fair

Regards,

Georg

[jasyoung · Accepted solution]

As a general rule, you will be able to bring up the interfaces and pass traffic, but you are likely to experience performance problems if you run the links anywhere near their capacity. IOS should throw a diagnostic error message if you install port adapters in a combination that exceeds the allowance for either side of the PCI bus; this allowance varies by the model of NPE/NSE you have installed. Cisco TAC will not support a chassis configuration that is outside the bandwidth point restrictions.

http://www.cisco.com/en/US/products/hw/routers/ps341/products_tech_note09186a008009446a.shtml#bandwidth_points

http://www.cisco.com/en/US/products/hw/modules/ps2033/products_configuration_guide_chapter09186a008014cf5c.html#1053970

[sjuneau]

Thank you very much for your answer