S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
36-2
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 36 Configuring SAN Port Channels
Information About SAN Port Channels
This section describes SANs and includes the following topics:
•
Understanding Port Channels and VSAN Trunking, page 36-2
•
Understanding Load Balancing, page 36-2
Understanding Port Channels and VSAN Trunking
Switches in the Cisco Nexus 5000 Series implement VSAN trunking and port channels as follows:
•
A SAN port channel enables several physical links to be combined into one aggregated logical link.
•
An industry standard E port can link to other vendor switches and is referred to as inter-switch link
(ISL), as shown on the left side of
Figure 36-1
.
•
VSAN trunking enables a link transmitting frames in the EISL format to carry traffic for multiple
VSAN . When trunking is operational on an E port, that E port becomes a TE port. EISLs connects
only between Cisco switches, as shown on the right side of
Figure 36-1
.
See
Chapter 35, “Configuring VSAN Trunking”
for information on trunk interfaces.
Figure 36-1
VSAN Trunking Only
You can create a SAN port channel with members that are E ports, as shown on the left side of
Figure 36-2
. In this configuration, the port channel implements a logical ISL (carrying traffic for one
VSAN).
You can create a SAN port channel with members that are TE-ports, as shown on the right side of
Figure 36-2
. In this configuration, the port channel implements a logical EISL (carrying traffic for
multiple VSANs).
Figure 36-2
Port Channels and VSAN Trunking
Understanding Load Balancing
Load-balancing functionality can be provided using the following methods:
•
Flow based—All frames between source and destination follow the same links for a given flow. That
is, whichever link is selected for the first exchange of the flow is used for all subsequent exchanges.
Switch 1
Any other
switch
ISL
E port
E port
Switch 1
Switch 2
EISL
TE port
TE port
Trunking
79938
EISL 3
EISL 2
EISL 1
Port channel
and trunking
Switch 1
Switch 2
ISL 3
ISL 2
ISL 1
Switch 1
Switch 2
79939
Port channel
Summary of Contents for N5010P-N2K-BE
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