Which protocol do Mobility Controllers (MCs) use to detect a failed Mobility Master (MM)?

Which protocol do Mobility Controllers (MCs) use to detect a failed Mobility Master (MM)?
A. PAPI
B. SNMP
C. VRRP
D. IPSec

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10 thoughts on “Which protocol do Mobility Controllers (MCs) use to detect a failed Mobility Master (MM)?

  1. Meanwhile, periodic PAPI keepalives will fail between the MC and the previously active MM before they connect to the newly promoted MM.

  2. A

    VRRP keepalives are periodically transmitted between
    the MM primary and standby. Should the primary MM fail, the standby MM will
    cease to receive these keepalives. Thus, the standby MM detects the primary
    MM as unavailable. The standby MM takes over as the active MM.
    Meanwhile, periodic PAPI keepalives will fail between the MC and the
    previously active MM before they connect to the newly promoted MM.

  3. PAPI
    MOD2
    You need to setup an IPsec tunnel between the two MMs in order to synchronize the configuration and databases.
    VRRP keepalives are periodically transmitted between the MM primary and standby.
    periodic PAPI keepalives will fail between the MC a nd the previously active MM before they connect to the newly promoted MM.

  4. I bet A.

    SNMP (B) is a strange answer.
    VRRP (C) is used for switchover in case of MM L2 redundancy, but the question is how MC discovers MM failure. There is no VRRP between MC and MM.
    IPSec (D) is used to dicover failure between MMs in case of L3 redundancy, but again the question is about how MC detects…

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