Traffic exceeds link capacity.

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1

We have router which connected 45m hssi(A) with FR switch.

That router contains two other interfaces, one is 45m hssi(B) and the
other is 100m fddi (C).

Because the most of the inbound traffic from (B) and (C) goes to
(A) interface, the toal inbound traffic of (B) and (C) cannot exceed
45m. (Is it right ?)

But the output rate of interface (A) exceeds 45m, -I can verify them
in "sh int <int-name>"-, it increases upto 60~70 mbps. (Not really,
but the statistic from CISCO commands.)

When the phenomenen occurs, the total inbound traffic of (B) and (C)
shows near 45 mbps (about 43.x mbps).

My question is:
   Is it true that it indicates 60~70 mbps ? (Of cause, it has many
   output drops.) or Is it bug?

   The cpu load increases upto 99%, and it freezes router for short
   time -about 1~2 minute-. How to resolve this errors ?

Our Router is:
   CISCO 7507
   RSP2
   IOS: 11.1.19 (CC)
   Enable CEF on (A): It is better than not using CEF. But the result
   doen't matter. (High CPU load, ..)

Any Idea ?

Thanks in advance

--Jaeho Yang.

2

When the phenomenen occurs, the total inbound traffic of (B) and (C)
shows near 45 mbps (about 43.x mbps).

My question is:
   Is it true that it indicates 60~70 mbps ? (Of cause, it has many
   output drops.) or Is it bug?

I recall this being a bug, I had a T1 that did 1.9 mb/s.

I recall 11.2.x or 11.1.21 fixing it.

   The cpu load increases upto 99%, and it freezes router for short
   time -about 1~2 minute-. How to resolve this errors ?

Our Router is:
   CISCO 7507
   RSP2
   IOS: 11.1.19 (CC)
   Enable CEF on (A): It is better than not using CEF. But the result
   doen't matter. (High CPU load, ..)

Any Idea ?

Thanks in advance

--Jaeho Yang.

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3

We're not talking an aggregate number here are we? Or is it that the
average in (or out) over the previous 5 minutes was greater than the speed
of the circuit?

  Brian

4

I would recommend upgrading to the latest version of CC IOS,
as there are a number of bugs (including an OSPF one) in the version
that you are running.

  11.1.21CC is currently the latest, and has been working well for
me for over two weeks.

  I seem to recall seeing a ddts related to it, but can't find the
exact one...

  - Jared