Bandwith Throttleing

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Sep 21st, 2007
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All, I have a 2801 and a 3800 routing WAN Traffic. At both ends, I have a SAN that we do replication with. My Question, I can I throttle the bandwidth or control how much bandwidth that the replication uses?

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spremkumar Fri, 09/21/2007 - 05:07
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AFAIK with SAN replication process around for seamless replication process you need high bandwidth between the locations to support the same.

do revert back on how much bandwidth you currently have between the sites and what kinda reservation plans you have in mind ..


Joseph W. Doherty Fri, 09/21/2007 - 19:04
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You should be able to either. As long as you can identify the SAN traffic from your other traffic, you can police/shape it (which sets a bandwidth maximum), define a minimum bandwidth guarantee, do both, or prioritize it so that it only use excess bandwidth.

rwamstutz Fri, 10/12/2007 - 11:38
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All, I have a 3mbps line. How would I limit the amount of bandwith the SAN would use, using a 2801 Router.

Thank you for your help.

Joseph W. Doherty Fri, 10/12/2007 - 16:00
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NB: Not sitting at a Cisco box, so syntax will likely be incorrect.

ip access-list extended SAN_Traffic

remark match traffic to/from SAN IP addr

permit ip any host (SAN IP ADDR)

permit ip host (SAN IP ADDR) any

class-map SAN_Traffic

match group SAN_Traffic

policy-map CBWFQ

class SAN_Traffic

!limit max to 1 Mbps and minimum 1 Mbps

!adjust to suit

shape (1 Mbps)

bandwidth (1 Mbps)


policy-map CBWFQ

class SAN_Traffic

!allow usage all all bandwidth

!but only guarantee 1% of link

!i.e. other traffic will get most of the link

!adjust to suit

bandwidth percentage 1

interface serial 0

service-policy out CBWFQ


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