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Configuring Multi-chassis Link Aggregation
Interaction with Other Features
This section contains important information about how other OmniSwitch features interact with MC-LAG
instances. Refer to the specific chapter for each feature to get more detailed information about how to
configure and use the feature. MC-LAG interaction with other features like:
Spanning Tree Protocol
Spanning Tree protocol is not allowed on logical dual-homed MC-LAG aggregates and on local MC-LAG
aggregates. Spanning Tree must be disabled on the local MC-LAG aggregates within each multi-chassis
peer. This is true regardless of the presence of active ports on both peer switches.MC-LAG provides an
alternative to Spanning Tree while supporting dual-homed connections between the edge and aggregation.
switches.
Since STP is disabled on MC-LAG ports, multi-chassis link aggregation provides a method of loop detec-
tion in order to detect an invalid network topology. The mechanism provides loop detection for any poten-
tial loops that include a set of MC-LAG aggregate ports. For more information, see
Detection" on page
8-12.
Ethernet Ring Protection
Ethernet Ring Protection (ERP) is not allowed to be configured on MC-LAG aggregates. ERP can be
configured on the virtual fabric link so that ERP packets can flow on this link. MC-LAG prevents VFL
from going to a blocking state on either side of the link regardless of the network topology when the VFL
is part of the ERP ring. In this case, if the VFL is ever blocked due to ERP convergence, a trap is gener-
ated and switch log is recorded and informed.
Link Aggregation
MC-LAG ports configured as dual-homed MC-LAG will not support standby ports.
Multicast
DVMRP and PIM are not supported with MC-LAG.
Source Learning
MC-LAG can be enabled only if the network operates in centralized source learning mode.
IPv4
IPv4 interfaces are supported on top of MC-LAG aggregates only through the use of a new type of VLAN
called Multi-Chassis Virtual IP VLANs. In other words, IPv4 interfaces can only be configured on a
VLAN that has a MC-LAG aggregate as a member of a "Multi-Chassis Virtual IP VLAN".
Multi-Chassis Virtual IP VLANs can only be configured on MC-LAG aggregates but not on any fixed
port or standard aggregate. However, they will always be automatically configured on the VFL link just
like all other VLAN types.
OmniSwitch AOS Release 7 Network Configuration Guide
March 2011
Interaction with Other Features
"MC-LAG Loop
page 8-21
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