Reduce network impact by applying password and clearing of the sessions on fabric links in a phased manner.
When an updated MD5 password is being applied on fabric links during fabric
configure, reduce network impact by applying the password and clearing sessions on
fabric links in a phased manner. First gather a list of neighbor sessions on each
device. Then, one device at a time, apply md5-password and clear a
single peering. Application of password and clearing of the neighbor session will be
done on both ends of the peering session simultaneously. Once the session is
established, the MD5 password will be applied on the next peering session. When all
the neighbor sessions on the device are updated, it will move to the next
device.
After clearing the session, it will take 10 seconds for the new session to be established. Before applying the new MD5 password, the session states are determined. After applying the password and clearing the session on both ends of the peering session, the session state is checked again. Only when the state matches with the previous (pre-password update) state on the session, or is better than the previous state (for example, previously the session was not established and the current state is established), it will move to updating the next neighbor session.
Note
The phased application of clearing the session and checking the state is performed only when the password is updated on a configured fabric and is not applicable during the configuration of a new fabric. Because the neighbor sessions will be created for the first time, during configuration of a new fabric with the MD5 password, there is no need to clear sessions.