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9-10
Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
78-18133-01
Chapter 9 Configuring Link Aggregation on the ML-Series Card
Monitoring and Verifying EtherChannel and POS
The Flood Ethernet traffic (Unknown MAC, Multicast and Broadcast frames) is transmitted on the first
active member of the port-channel.
The routed IP Unicast traffic from the ML-Series towards the port channel ports is transmitted on either
interface based on the result of the "Exclusive OR" (XOR) operation applied on the second least
significant bits of the source and destination IP address of the IP packet. So if the "XOR" result of the
IP packets Source Address least significant bit and Destination Address least significant bit is 0 then the
frame is on the first member port and if the result is 1 then the frame is transmitted on the second member
port.
On the 4 port EtherChannel the second and third least significant bits are used for load balancing.
101Port 2
110Port 1
Table 9-1 MAC Based- 2- Port Channel Interface
Second Least
Significant bit of the
MAC-DA
Second Least
Significant bit of the
MAC-SA XOR Result
Used Member Interface
for the Frame
Forwarding to the
EtherChannel and/or
Port Channel
Table 9-2 IP Based- 2- Port Channel Interface
Second Least
Significant bit of the
IP-DA
Second Least
Significant bit of the
IP-SA XOR Result
Used Member Interface
for the Frame
Forwarding to the
EtherChannel and/or
Port Channel
000Port 1
011Port 2
101Port 2
110Port 1
Table 9-3 MAC Based - 4-Port Channel Interface
Third Least
Significant bit
of the MAC-DA
Third Least
Significant bit
of the MAC-SA
Second Least
Significant bit
of the MAC-DA
Second Least
Significant bit
of the MAC-SA XOR Result
Used Member
Interface for
the Frame
Forwarding to
the
EtherChannel
and/or Port
Channel
000000First
000101Second