04-07-2008 02:54 AM - edited 03-05-2019 10:14 PM
It appears to be a simple question, but I cannot get a clear answer:
What is the bandwidth of an SVI interface on a cat6500?
Thanks,
Marcel
04-07-2008 03:00 AM
Hi
Its 100mb.
Thanks
Mahmood
04-07-2008 04:04 AM
I can hardly believe that. How do you know?
Marcel
04-07-2008 04:22 AM
Hi Marcel
You can check it by using the "show interface vlan x" command.
For me it showed 1000000kbits per second (1 Gbps) on a 6509 and a 4948.
Cheers:
Istvan
04-07-2008 04:29 AM
This is the administrative bandwidth, used by eg OSPF and EIGRP to make routing decisions.
I mean the real bandwidth, or speed (as used with real ethernet), or clock rate (used with serial lines).
That administrative BW can be changed with the interface command: bandwidth [1..10000000]
Marcel
04-07-2008 04:38 AM
Hi Marcel,
This is true, it is the administrative bandwidth.
Physically you can be connected to a Fastethernet, Gigabitethernet or a Tengigabitethernet interface. The physical connection will give you the real bandwith you can have.
Cheers:
Istvan
04-07-2008 04:51 AM
Marcel
I believe that there is a logical fallacy in your question. You ask:
"I mean the real bandwidth, or speed (as used with real ethernet), or clock rate (used with serial lines)."
but real bandwidth (or real speed) exists only on physical interfaces. A SVI is a virtual interface and as such does not have a real bandwidth. If anything the bandwidth of a SVI is the bandwidth of the backplane of the switch.
HTH
Rick
04-07-2008 07:35 AM
True, but I did not want to influence your answers.
What I've learned from several documents on CCO, that an SVI is using the backplane. On a cat6500 this is a 6 Gbps EtherChannel.
Is the folllowing correct:
All SVIs share the available bandwidth of 6 Gbps of the backplane.
The thing I try to get clear is related to the following configuration:
I have an FWSM in the cat6500, with multiple virtual firewalls. At this moment each outside interface of the firewall has it's own SVI on the router.
If I combine all outside interfaces on one SVI (all outsides are in the same L3 subnet), does this impact the available bandwidth?
How about SVI-SVI traffic, and FW-FW traffic?
As you can see, there is no physical port involved. The physical ports are all behind the firewalls.
I know I can configure QoS on the different FW-contexts, but this question is about the bandwidth on the router (or MSFC).
Looking forward to your insights!
Marcel
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