Alcatel-Lucent 7750 SR OS Service Manual page 411

Each spoke SDP has a Read Only operational state that shows which BPDU encapsulation is
currently active on the spoke SDP. The following states apply:
•
•
Dot1d is the initial and only spoke SDP BPDU encapsulation state for spoke SDPs defined on
Ethernet interface with encapsulation type set to null.
Each transition between encapsulation types optionally generates an alarm that can be logged and
optionally transmitted as an SNMP trap.
Configuring VPLS spoke SDPs with Split Horizon
To configure spoke SDPs with a split horizon group, add the split-horizon-group parameter when
creating the spoke SDP. Traffic arriving on a SAP or spoke SDP within a split horizon group will
not be copied to other SAPs or spoke SDPs in the same split horizon group.
Example
config>service>vpls# spoke-sdp 51:15 split-horizon-group DSL-group1
config>service>vpls>spoke-sdp $ no shutdown
config>service>vpls>spoke-sdp # exit
config>service>vpls#split-horizon-group DSL-group1
config>service>vpls>split-horizon-group# description "Split horizon
group for DSL"
config>service>vpls>split-horizon-group#exit
The following example displays the VPLS configuration with split horizon enabled:
*A:ALA-1>config>service# info
----------------------------------------------
...
vpls 800 customer 6001 vpn 700 create
description "VPLS with split horizon for DSL"
stp
exit
7750 SR OS Services Guide
Dot1d specifies that the switch is currently sending IEEE 802.1D standard BPDUs. The
BPDUs will be tagged or non-tagged based on the encapsulation type of the egress
interface and the encapsulation value defined in the spoke SDP. A spoke SDP defined on
an interface with encapsulation type dot1q will continue in the dot1d BPDU encapsulation
state until a PVST encapsulated BPDU is received, after which the spoke SDP will
convert to the PVST encapsulation state. Each received BPDU must be properly IEEE
802.1q tagged if the interface encapsulation type is defined to dot1q.
PVST specifies that the switch is currently sending proprietary encapsulated BPDUs.
PVST BPDUs are only supported on Ethernet interfaces with the encapsulation type set to
dot1q. The spoke SDP continues in the PVST BPDU encapsulation state until a dot1d
encapsulated BPDU is received, in which case the spoke SDP reverts to the dot1d
encapsulation state. Each received BPDU must be properly IEEE 802.1q tagged with the
encapsulation value defined for the spoke SDP.
:
config>service# vpls 800
shutdown
Virtual Private LAN Services
Page 411