Lenovo ThinkSystem NE2552E Application Manual page 196

196
NE2552E Application Guide for ENOS 8.4
Figure 17. VLAG Application with Multiple Layers
Layer 2/3 Border
Layer 2 Region
with multiple levels
VLAG 3
VLAG 3
VLAG
Peers A
VLAG 1
LAG
Servers
Wherever ports from both peered switches are aggregated to another device, the
aggregated ports must be configured as a VLAG. For example, VLAGs 1 and 3
must be configured for both VLAG Peer A switches. VLAGs 2 and 4 must be
configured for both VLAG Peer B switches.VLAGs 3, 5 and 6 must be configured
on both VLAG Peer C switches. Other devices connecting to the VLAG peers are
configured using regular static or dynamic LAGs.
Note: Do not configure a VLAG for connecting only one switch in the peer set to
another device or peer set. For instance, in VLAG Peer C, a regular LAG is
employed for the downlink connection to VLAG Peer B because only one of the
VLAG Peer C switches is involved.
LAG
VLAG 5
ISL
ISL
LACP-capable
Switch
LACP-capable
Routers
LAG
VLAG 6
VLAG
Peers C
LAG
VLAG 4
ISL
VLAG 2
LAG
LACP-capable
Server
VLAG
Peers B