hi,everyone
i got a very strage problem about stm-1 which installed in a cisco 7606-s
chassis with a sup-32 engine.
according to the 3-7-3 divide the stm-1 into 63 2MB E1 ports that are connected
to our branch devices,respectively
recently,many 2MB lines have encountered varying packet
C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1. Why would this traffic not
I wouldn't recommend using that IOS as it was deferred a long time ago
for IPSEC/GETVPN issues to name just a few - as well as T2, T3, etc.
Try the latest 12.4(15)T13/T14 release, but I don't think it will help
the CPU
I have a question I have been thinking about.
Let's say we purchased a 5Mbit Ethernet Link. The physical speed of
the link is 10Mbit, so we shape outbound traffic to 5Mbit, like such:
class-map ef
match ip dscp ef
class-map af4
match ip dscp af41, af42, af43
class-map af3
match ip dscp af31,
On Sat, 9 Oct 2010, Roger Wiklund wrote:
So, as we shape, as long as we have buffers, we will never see any tail
drops, as we will just delay the packets until we send it, correct?
Buffers are not infinite, so you might still see tail drops.
If this e1 is 100% utilized, we will get tail
Buffers are not infinite, so you might still see tail drops.
Indeed, but I'm thinking if I only apply the qos policy-map, I
switch from fifo to CBWFQ with multiple software queues, and buffers.
If I on top of that do shaping, would I not utilize yet another
buffer? I.E. the shaping buffer.
Roger,
This is a sub rate link, as you use a physical rate of 10Mbps with a
downstream service of 5Mbps - This means that somewhere down the link
(on the SP network) they would be dropping anything above 5Mbps.
Your router does not have any way (except shaping) to know that there is
a limit for
Both policing and shaping are tools to use when dealing with sub-rates. The
whole point with a shaper is to create a virtual interface speed and thus
make use of the output queues earlier. In that perspective shaping to the
interface speed is rather pointless.
--
Pelle
(sorry about the
In that perspective shaping to the
interface speed is rather pointless.
Yeah that's what I belive also. This whole thing started with a person
at my work telling me that we should shape a 1984 to 1984 just to
delay packets instead of tail dropping.
I just wanted to get my head around this.
Yes you are correct, shaping will keep packets from being dropped until the
queues are full. However, once the queues are full there is nothing else
for the router to do but tail drop. This is true with or without shaping.
Also, adding buffers does not add more memory to be used to queue
On Sat, 9 Oct 2010, Roger Wiklund wrote:
Yeah that's what I belive also. This whole thing started with a person
at my work telling me that we should shape a 1984 to 1984 just to
delay packets instead of tail dropping.
I don't get it. Tail dropping is what you do when the queue is full,
I don't get it. Tail dropping is what you do when the queue is full, you're
delaying a lot of packets and you don't want to fill the queue any more.
Saying we should delay packets instead of tail dropping just doesn't make
any sense to me.
Exactly, this was basically my initial response to
I don't get it. Tail dropping is what you do when the queue is full, you're
delaying a lot of packets and you don't want to fill the queue any more.
Saying we should delay packets instead of tail dropping just doesn't make
any sense to me.
Exactly, this was basically my initial response to
My voice SBC (Acme Packets) shares the same subnet, and even the same Cisco
switch, with a couple of other devices (including a Cisco GSR 12800, Cisco
Pix, and a Cisco 7206VXR). When pinging the SBC from non-cisco devices, the
response time is 0/0/0 ms, as one would expect. When pinging from
Hi guys,
I'm always confused with the use of MPPS .
I understand Mpps is million packets per second.
But if customer asks me he has 10G traffic in and 10G traffic out .
Now whie planning for card and device whats practical use of MPPS.
Regards
___
On Sun, 10 Oct 2010, jack daniels wrote:
But if customer asks me he has 10G traffic in and 10G traffic out .
Now whie planning for card and device whats practical use of MPPS.
Worst-case, take in+out bytes/s and divide by something like 64 to get a
ddos scenario performance figure.
For
Exactly, and this is why we need shaping for a sub rate link - the
router would not use the different class configuration for the different
traffic classes unless it knows that the link is congested.
If we use a 10Mbps link for a 5Mbps service (or even worst a 1GE link
for a 150Mbps service...)
do u have any doc for the calculation will be of great help.
or please explain with example the calculation
10X
On Sun, Oct 10, 2010 at 9:53 AM, Mikael Abrahamsson swm...@swm.pp.se wrote:
On Sun, 10 Oct 2010, jack daniels wrote:
But if customer asks me he has 10G traffic in and 10G traffic
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