Operation In The Network - Dell Networking N4000 Series Configuration Manual

Operation in the Network

Below is a sample MLAG topology and discussion:
Figure 28-11. Example MLAG Topology
In Figure 28-11:
1 VLAN 10 spans the MLAG network.
2 P and S are MLAG-aware peer devices. P stands for primary and S stands
for secondary. The roles are elected after the DUTs exchange keep-alive
messages. The two devices are connected with a peer-link {P3/P4–S3/S4}.
Ports P1, S1 are members of MLAG1 and ports P2, S2 are members of
MLAG2.
3 A port-channel must be configured as the peer-link. In Figure 28-11, P3,
P4 and S3, S4 are the port-channel ports that form the peer-link.
4 MLAG devices select the roles based on keep-alive messages that run over
the peer-link.
5 A, B, and C are MLAG-unaware devices.
6 A, B, and C are partner devices that form an MLAG with P and S. On A, B,
and C, the aggregation is a regular LAG.
7 MLAG links are shown in blue.
C1
Peer-Link
P5
P3,P4
P
P1 P2
MLAG 1
A
C
C2
MLAG3
S3,S4
S1
MLAG 2
Configuring Link Aggregation
VLAN 10
S5
S
S2
B
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