Attempting to throttle bandwidth for specific ports on Cisco MDS 93128

My goal is to throttle the bandwidth of two of the 40Gig interfaces on my cisco MDS93128 switch running Cisco Nexus OS V 6.1(2)I3(1).

The ports are being used for replication between two EMC SANs.

I would like to limit the total bandwidth available for these ports down to 1Gig.  

This is intended to simulate the bandwidth I have available on a P2P circuit that connects my two data-centers.

Is is possible to implement this type of throttling using built in QOS on the MDS switch? If not is there something else I can do to achieve similar results.

Here are the interface configs.  The interfaces are both using 10Gig Transceivers.

    Ethernet2/5
    transceiver is present
    type is 10Gbase-SR
    name is CISCO-SUMITOMO
    part number is SPP5100SR-C5
    revision is A
    serial number is XXXXXXXX
    nominal bitrate is 10300 MBit/sec
    Link length supported for 50/125um OM2 fiber is 82 m
    Link length supported for 62.5/125um fiber is 26 m
    Link length supported for 50/125um OM3 fiber is 300 m
    cisco id is --
    cisco extended id number is 4

Ethernet2/6
    transceiver is present
    type is 10Gbase-SR
    name is CISCO-SUMITOMO
    part number is SPP5100SR-C5
    revision is A
    serial number is XXXXXXXX
    nominal bitrate is 10300 MBit/sec
    Link length supported for 50/125um OM2 fiber is 82 m
    Link length supported for 62.5/125um fiber is 26 m
    Link length supported for 50/125um OM3 fiber is 300 m
    cisco id is --
    cisco extended id number is 4


interface Ethernet2/5
  description EMCVMAX2 SRDF Slot 2
  switchport access vlan 8
  spanning-tree port type edge
  vpc orphan-port suspend

interface Ethernet2/6
  description EMCVMAX1 SRDF Slot 1
  switchport access vlan 8
  spanning-tree port type edge
  vpc orphan-port suspend
Tanner CroweAsked:
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Rich RumbleSecurity SamuraiCommented:
QoS is the only way I know of doing that, unless you change the link speeds of the interfaces themselves to 1000/Auto. I guess another way would be to to place something in between the links that can only talk 1G.
-rich
1
Tanner CroweAuthor Commented:
Thanks,

Do you know how I would implement this with QOS?
Looking through the documentation for the Nexus QOS configuration I could only see how to set a percentage of bandwidth for the switch, but not a specific speed for those ports.
0
Rich RumbleSecurity SamuraiCommented:
QoS does percentages, you'd use the old
conf t
int ethernet2/5
speed 1000

I don't have a 40G port to mess with though, so those commands may not work, you can try to see what is in the "speed-group" command of the interface, or a show interface capabilities to see if they can even be set any lower than 10G. If not, then QoS will probably be the only way.
"shape average percent 90 "
(or something to that effect)
-rich
0

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