88
(QCT) (Config-mac-access-list)#exit
3. Configure the destination port as port 0/18.
(QCT) (Config)#port-monitor session 1 destination interface 0/18
4. Configure the source port as port 0/2.
(QCT) (Config)#port-monitor session 1 source interface 0/2
5. Enable the port mirroring session.
(QCT) (Config)#port-monitor session 1 mode
6. To filter L3 traffic so only flows that match the rules in the IP ACL called IPACL are mirrored to the
destination port, add the IPACL ACL.
(QCT) (Config)#port-monitor session 1 filter ip access-group IPACL
7. To filter L2 traffic so only flows that match the rules in the MAC-based ACL called MACL are mirrored to
the destination port, add the MACL ACL.
(QCT) (Config)#port-monitor session 1 filter mac access-group MACL
(QCT) (Config)#exit
Note: Both IP ACL and MAC ACL cannot be configured for one session at the same time.
3.8. Spanning Tree Protocol
Spanning Tree Protocol (STP) is a layer 2 protocol that provides a tree topology for switches on a bridged
LAN. STP allows a network to have redundant paths without the risk of network loops. STP uses the
spanning-tree algorithm to provide a single path between end stations on a network.
QNOS software supports Classic STP, Multiple STP, and Rapid STP.
3.8.1. Classic STP, Multiple STP, and Rapdi STP
Classic STP provides a single path between end stations, avoiding and eliminating loops. Multiple Spanning
Tree Protocol (MSTP) is specified in IEEE 802.1s and supports multiple instances of Spanning Tree to
efficiently channel VLAN traffic over different interfaces. Each instance of the Spanning Tree behaves in the
manner specified in IEEE 802.1w, Rapid Spanning Tree (RSTP), with slight modifications in the working but
not the end effect (chief among the effects, is the rapid transitioning of the port to Forwarding). The
difference between the RSTP and the traditional STP (IEEE 802.1D) is the ability to configure and recognize
full-duplex connectivity and ports which are connected to end stations, resulting in rapid transitioning of
the port to the Forwarding state and the suppression of Topology Change Notifications.
MSTP is compatible to both RSTP and STP. It behaves appropriately to STP and RSTP bridges. A MSTP bridge
can be configured to behave entirely as a RSTP bridge or a STP bridge.
3.8.2. STP Operation
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