Specifications

272 Implementing IBM System Networking 10Gb Ethernet Switches
To configure the 802.1p parameters, run the following commands:
򐂰 Run qos transmit-queue mapping <priority (0-7)> <COSq number> to map the 802.1p
priority to the Class of Service queue (COSq) priority. Enter the 802.1p priority value
(0 - 7), followed by the Class of Service queue that handles the matching traffic.
򐂰 Run qos transmit-queue weight-cos <COSq number> <weight (0-15)> to configure the
weight of the selected Class of Service queue (COSq). Enter the queue number (0 - 1),
followed by the scheduling weight (0 - 15).
򐂰 Run show qos transmit-queue to shows the current 802.1p parameters.
DSCP configuration
The following commands map the DiffServ Code Point (DSCP) value of incoming packets to
a new value or to an 802.1p priority value:
򐂰 Run qos dscp dscp-mapping <DSCP (0-63)> <new DSCP (0-63)> to map the initial
DiffServ Code Point (DSCP) value to a new value. Enter the DSCP value (0 - 63) of
incoming packets, followed by the new value.
򐂰 Run qos dscp dot1p-mapping <DSCP (0-63)> <priority (0-7)> to map the DiffServ
Code point value to an 802.1p priority value. Enter the DSCP value, followed by the
corresponding 802.1p value.
򐂰 Run [no] qos dscp re-marking to turn on or off DSCP re-marking globally.
򐂰 Run show qos dscp to show the current DSCP parameters.
6.5 High availability
This section presents high availability mechanisms in the Virtual Fabric 10Gb Switch Module.
The topics described in this section are:
򐂰 Stacking
򐂰 Layer 2 Failover
򐂰 Trunking
򐂰 Hot Links
򐂰 VRRP
6.5.1 Stacking
A stack is a group of up to eight Virtual Fabric 10Gb Switch Module devices that work
together as a unified system. Because the multiple members of a stack act as a single switch
entity with distributed resources, high-availability topologies can be more easily achieved.
A simple stack using two switches provides full redundancy in the event that either
switch fails.
Stacking permits ports within different physical switches to be trunked together, further
enhancing switch redundancy.
For a detailed presentation of failover stacking mechanisms, see 6.2, “Stacking” on page 240.