11-10-2011 02:30 AM - edited 03-11-2019 02:48 PM
Hi,
With regards to the following example provided by Cisco I would like to know exactly when the failover would occur. Does the failover kick in when one/two packets are lost or all three? I would hope all three.
If I were to change the number of packets to 100 and lost 50% for example this would show the link to be failing but would the ASA actually failover to the backup DSL?
I'd like to implement this setup in a real world scenario but the internet connection can be tempremental at times (yes I have complained to my ISP in Johannesburg but what is acceptable to me is on a different level to them!) so I want to avoid the failover flapping between each internet link.
Tony
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11-10-2011 07:29 AM
Hi Tony,
The ASA's SLA tracking configuration is not quite granular enough to do what you're describing. If the ASA receives a reply for any request within the configured timeout, the ASA will consider the primary link up.
In the example you linked to, the ASA will send 3 requests every 10 seconds. If the ASA receives a reply to any of those 3 packets with a response time that is under 5000 milliseconds (the default timeout for SLA monitoring), the primary link will remain up. Unfortunately, the ASA does not allow you to base the up/down decision on the percentage of packets lost.
Hope that helps.
-Mike
11-10-2011 07:29 AM
Hi Tony,
The ASA's SLA tracking configuration is not quite granular enough to do what you're describing. If the ASA receives a reply for any request within the configured timeout, the ASA will consider the primary link up.
In the example you linked to, the ASA will send 3 requests every 10 seconds. If the ASA receives a reply to any of those 3 packets with a response time that is under 5000 milliseconds (the default timeout for SLA monitoring), the primary link will remain up. Unfortunately, the ASA does not allow you to base the up/down decision on the percentage of packets lost.
Hope that helps.
-Mike
11-10-2011 07:37 AM
Thanks Mike, that asnwers my question.
Regards,
Tony
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