Cisco Cisco Dynamic Fabric Automation for OpenStack Troubleshooting Guide
Cisco Dynamic Fabric Automation Production Troubleshooting Guide
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An EVB protocol timer in 802.1Q-2014 standard is expressed as a timer exponent whose definition is a value between
0 and 31, representing a positive integer for the exponent of 2, which forms the multiplier of 10 microseconds to give
the timer value. For example, a value of 4 means the associate timer value equals 2^4 x 10 μs, or 160 μs.
0 and 31, representing a positive integer for the exponent of 2, which forms the multiplier of 10 microseconds to give
the timer value. For example, a value of 4 means the associate timer value equals 2^4 x 10 μs, or 160 μs.
The table below indicates some default exponent values used on DFA leaf switches and the Nexus 1000V switch:
Exponent value
Approximate timer value
14 (default ECP retransmission value)
163 milliseconds
20 (default keepalive value on Nexus1000V
switch)
switch)
10 seconds
25 (default resource-wait value on leaf
switch)
switch)
335 seconds
27 (default keepalive value on leaf switch)
22 minutes
3.5 VDP Profile Instantiation (High-level overview)
The major steps involved in the segment-based profile instantiation are:
-
An association request is made for a given segment.
-
If the segment’s configuration has not yet been instantiated, the HMM process retrieves the necessary infor-
mation from the LDAP database via ADBM process.
-
In parallel, the HMM requests a free dynamic VLAN from the VLAN manager process
-
When profile contents and parameters are available, the HMM process requests the port-profile process to
apply the parametrized configuration.
ADBM/LDAP
HMM
PPM/VSH
EVB
1/ Notify of a new segment
ID – Send a new segment ID notification
Vlan Mgr
2a/ Retrieve network and tenant
profile content parameters
profile content parameters
2b/ Request a free dynamic VLAN
and map it to the segment ID
and map it to the segment ID
3/ Apply configuration