Dell Brocade DCX, Руководство по настройке

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BigIron RX Series Configuration Guide 401
53-1001810-01
Ring initialization for shared interfaces
14
RHP processing in rings with shared interfaces
Interfaces on an MRP ring have one of the following states:
•
Preforwarding (PF) – All ring interfaces are in this state when you enable MRP.
•
Forwarding (F) – An interface changes from Preforwarding to Forwarding when the port’s
preforwarding time expires.
•
Blocking (B) – The interface cannot forward data. Only the secondary interface on the Master
node can be Blocking.
The primary interface of the master node initiates the RHP packets and sends it on the ring. When
the packet reaches an interface, MRP checks to see if the receiving interface is a regular port or a
tunnel port.
If the port is a regular port, the RHP packet is forwarded to the next interface. Forwarding of the
packet continues on the ring until the secondary interface of the master node receives the packet
and blocks it.
If the port is a tunnel port, MRP checks the priority of the RHP packet and compares it to the
priority of the tunnel port:
•
If the RHP packet’s priority is less than or equal to the interface’s priority, the packet is
forwarded through that interface.
•
If the priority of the RHP packet is greater than the priority of the interface, the RHP packet is
dropped.
Normal flow
Figure 72 shows an example of how RHP packets are processed normally in MRP rings with shared
interfaces.
FIGURE 72 Flow of RHP packets on MRP rings with shared interfaces
Ring 1
Ring 2
S3
S4
S1
S2
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
1,2
1,2
Master node
(secondary interface) port2/2
(primary interface) port2/1
Master node
port3/2 (secondary interface)
port3/1 (primary interface)
= Ring 1 RHP packet
= Ring 2 RHP packet
T
T