Brocade MLX Series and NetIron XMR Hardware Installation Guide 231
53-1003821-01
Managing the device
6
MP Presence from LP Detection (Headless Router Operation)
On entering a state where the MPs go down, the chassis enters a headless state. The LPs are
unaware of the MP’s state and continue to perform. Hardware flooding traffic is processed and
traffic is dropped that needs to pass through the MP. To avoid this situation, the LP maintains the
MP state and brings itself down in case no MPs are present as shown in Table 33.
To know the presence of MP by LP, accounting of IPC and keep-alive messages from the MP are
performed in the LP.
The current state of MP presence is displayed when you enter the ipc show mp-presence state
command as shown in Table 34.
TABLE 33 MP Presence Detection LP State on Bringing DOWN the LP Card/Port
LP State Description Support MP Presence Detection
DOWN Line cards are
powered off,
when MP
absence is
detected.
LP supports
placing the line
cards in the
DOWN state.
1 LP cards will be power cycled and brought to the
UP state.
2 LP image will SYNC with MP image on boot of
the LP.
INTERACTIVE Line cards are
placed in
interactive mode.
LP does not
support placing
the line cards in
the INTERACTIVE
state.
1 LP cards will be power cycled and brought to the
UP state.
2 LP image will SYNC with MP image on boot of
the LP.
Administrative
port DOWN
Ports on the line
card are placed in
the DOWN
administrative
state.
LP supports
placing the ports
on the line card in
the DOWN state.
1 LP cards will be power cycled and brought to the
UP state.
2 LP image will SYNC with MP image on boot of
the LP.
3 Ports on the line card are place in the UP
administrative state.
TABLE 34 MP-Presence States for Show MP-Presence State
MP Presence State
MP_ALIVE
MP_SWITCH
MP_SDS_CON
MP_WAIT
MP_ALIVE_DISABLED
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