Configuration Guide User guide

FastIron Configuration Guide 619
53-1002494-02
Metro Ring Protocol
Each RHP also has a sequence number. MRP can use the sequence number to determine the
round-trip time for RHPs in the ring. Refer to “Metro Ring Protocol diagnostics” on page 628.
RHP processing in MRP Phase 2
Figure 46 shows an example of how RHP packets are processed normally in MRP rings with shared
interfaces.
FIGURE 46 Flow of RHP packets on MRP rings with shared interfaces
Customer A
Customer A
Customer A
Customer A
Switch B
Switch A
Switch C
Switch D
F
F
F
F
PF
PF
PF
PF
PF
F
F
B
Secondary port
receives RHP 1
and changes to
Blocking
Primary port then
sends RHP 2 with
forwarding bit on
Master
Node
Forwarding bit is on.
Each port changes from
Preforwarding to Forwarding
when it receives this RHP.
RHP 2