Cisco Cisco MDS 9500 Series Supervisor-2 Module Libro blanco
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could only enforce a given QoS policy map where traffic destined for a congested output port was arriving on the same input port. This typically
required incoming traffic to be aggregated onto common input ports such as ISLs, hence the multiswitch requirement. Second-generation line-card
modules and supervisors enforce QoS on egress, removing this limitation and enabling QoS to be effective in single-switch environments and where
there is congestion on ISLs.
Table 1 lists first-generation Fibre Channel line cards.
Table 1.
First-Generation Fibre Channel Line Cards
Cisco Part Number
Description
DS-X9016
16-port 1/2-Gbps Fibre Channel module
DS-X9032
32-port 1/2-Gbps Fibre Channel module
DS-X9032-SSM
32-port 1/2-Gbps Fibre Channel storage services module
DS-X9302-14K9
2-port 1-Gigabit Ethernet IPS, 14-port 1/2-Gbps Fibre Channel module
Table 2 lists second-generation Fibre Channel line cards.
Table 2.
Second-Generation Fibre Channel Line Cards
Cisco Part Number
Description
DS-X9112
12-port 1/2/4-Gbps Fibre Channel module
DS-X9124
24-port 1/2/4-Gbps Fibre Channel module
DS-X9148
48-port 1/2/4-Gbps Fibre Channel module
DS-X9704
4-port 10-Gbps Fibre Channel module
QoS CONFIGURATION
QoS is a licensed feature and requires an Enterprise Package license installed on all switches where QoS is enabled. Although QoS is a licensed
feature, users can try licensed features for up to 120 days using a license grace period.
QoS configuration should be consistent across multiple switches to help ensure that all switches are enforcing a common policy for traffic in both
send and receive directions.
QoS is configured in an identical manner regardless of whether the switch has first-generation or second-generation line cards present. QoS can be
deployed in any one of three ways depending on the complexity of the QoS policy desired:
•
Virtual SAN (VSAN)–based QoS
•
Zone-based QoS
•
Individual QoS policies matching individual devices
VSAN-Based QoS
VSAN-based QoS enables QoS priority to be assigned on a per-VSAN basis.
VSAN-based QoS enables individual VSANs to be configured with a high, medium, or low QoS priority. All traffic flow between devices in that
VSAN will inherit the desired priority.