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Configuring Link Aggregation 947
MLAG domain for the MLAG feature to automatically utilize the peer-link to
forward packets around failures. MLAG VLANs may have IP addresses
assigned, but MLAG VLANs cannot be used to route across MLAG or non-
redundant VLANs, as the MLAG feature does not correlate failures in one
VLAN with another VLAN to unblock packets crossing the MLAG peer-link.
Recommended L3 Connectivity
The topology shown in Figure 28-12 uses the MLAG switches as L2 switches.
All VLANs traverse the MLAG topology from the top switches/routers to the
bottom switches/routers. The LAGs for each VLAN host are in a separate
VPC. The router sees the port-channel as a single logical interface with
multiple VLANs. This topology is highly recommended as it utilizes MLAG
in the scenario for which it was intended (redundant full-bandwidth
replacement for spanning tree) and allows the MLAG peers to detect failures
and unblock the appropriate VLANs on the peer link so that traffic flow can
continue unimpeded.
Figure 28-12. Recommended L3 Connectivity
MLAG Router PeerMLAG Router Peer
Peer-Link
VLAN 10
Host
MLAGs
L3 Router
MLAG
VLAN 10, 20, 30
Failed Link
VLAN 20
Host
VLAN 30
Host