Specifications

200 ExtremeWare XOS 11.0 Concepts Guide
Spanning Tree Protocol
STPD Identifier
An StpdID is used to identify each STP domain. You assign the StpdID when configuring the domain,
and that carrier VLAN of that STPD cannot belong to another STPD.
An StpdID must be identical to the VLANid of the carrier VLAN in that STP domain.
NOTE
If an STPD contains at least one port not in 802.1D mode, you must configure the STPD with an
StpdID.
STP States
Each port that belongs to a member VLAN participating in STP exists in one of the following states:
• Blocking
A port in the blocking state does not accept ingress traffic, perform traffic forwarding, or learn MAC
source addresses. The port does receive STP BPDUs. During STP initialization, the switch always
enters the blocking state.
• Listening
A port in the listening state does not accept ingress traffic, perform traffic forwarding, or learn MAC
source addresses. The port does receive STP BPDUs. This is the first transitional state a port enters
after being in the blocking state. The bridge listens for BPDUs from neighboring bridge(s) to
determine whether the port should or should not be blocked.
• Learning
A port in the learning state does not accept ingress traffic or perform traffic forwarding, but it begins
to learn MAC source addresses. The port also receives and processes STP BPDUs. This is the second
transitional state after listening. From learning, the port will change to either blocking or forwarding.
• Forwarding
A port in the forwarding state accepts ingress traffic, learns new MAC source addresses, forwards
traffic, and receives and processes STP BPDUs.
• Disabled
A port in the disabled state does not participate in STP; however, it will forward traffic and learn
new MAC source addresses.
Binding Ports
The two ways to bind (add) ports to an STPD are: manually and automatically. By default, ports are
manually added to an STPD.
Manually Binding Ports
To manually bind ports, use one of the following commands:
• configure stpd <stpd_name> add vlan <vlan_name> ports [all | <port_list>] {[dot1d
| emistp | pvst-plus]}
• configure vlan <vlan_name> add ports [all | <port_list>] {tagged | untagged}
{nobroadcast} stpd <stpd_name> {[dot1d | emistp | pvst-plus]}