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DNS, which measures the time taken for a DNS resolution. This measures the difference between the time
taken to send a request to the DNS server and the time the IP SLA source receives a reply.
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User Datagram Protocol (UDP) Jitter, which measures RTT, one way jitter and one way delays.
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UDP Jitter for VoIP, which measures RTT, one way jitter, one way delays, ICPIF (Impairment Calculated
Planning Impairment Factor) and MOS (Mean Opinion Score).
Limitations for IPSLA support on Aruba switches:
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IP SLA is not enabled for IPv6.
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DHCP SLA supports DHCPv4 only.
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IP SLA tests cannot be initiated over OOBM interfaces.
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History results for the configured IP SLAs will not be available after a switchover or a reboot.
•
Maximum number of IP SLAs that can be configured varies based on the type of SLA test.
•
When there are multiple IP SLAs configured with destination as hostname, the DNS resolution happens
serially. There can be a delay in sending the test probe (which will be sent only after successful DNS
resolution).
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For TCP Connect SLA type, the four-tuple (source IP/port, destination IP/port) must be unique.
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System clocks between the source and the responder must be synchronized with NTP if One Way Delay
parameters have to be calculated for UDP Echo tests.
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Timeout for probes is 3 seconds for all SLA types and is not configurable.
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Transient spikes in RTT occur during the tests (in the source and the responder) if processor usage is high.
Consider average result values over a period of time rather than point-in-time results. This is not applicable for
UDP Jitter nor Jitter for VoIP.
Entity
Maximum number of SLAs enabled.
Maximum history bucket size per SLA.
Number of responders that can be configured.
1
Not applicable for UDP Jitter and Jitter for VoIP.
The following are operational restrictions with respect to IP SLA jitter implementation:
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Feature is not supported on 2540.
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Feature is supported only on v3-based platforms (5400R, 3810, 2930F).
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No history results are stored.
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IPSLA Jitter and Jitter for VoIP initiator and responder is only supported on 5400R with v3 modules
(noncompatibility mode), 3810, and 2930F switches.
•
The maximum number of Jitter responder sessions (UDP Jitter + Jitter For VoIP) supported is 10. The
maximum number of Jitter initiator sessions (UDP Jitter + Jitter For VoIP) supported is 5.
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IMC (Intelligent Management Center) supports below IP SLAs:
Chapter 17 IP Service Level Agreement
Limit
50
1
50
10
587
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Table of Contents
Troubleshooting
