Juniper ACX1000 Configuration Manual page 463

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Copyright © 2017, Juniper Networks, Inc.
Spanning-Tree Instance (MSTI) controls topology within regions. MSTP uses RSTP as
a converging algorithm and is fully interoperable with earlier versions of STP.
VSTP maintains a separate spanning-tree instance for each VLAN. Different VLANs
can use different spanning-tree paths. When different VLANs use different
spanning-tree paths, the CPU processing resources being consumed increase as more
VLANs are configured. VSTP BPDU packets are tagged with the corresponding VLAN
identifier and are transmitted to the multicast destination media access control (MAC)
address 01-00-0c-cc-cc-cd
by pure IEEE 802.1q bridges.
ACX Series routers can support up to 128 STP instances, which includes all instances of
VSTP, MSTP, RSTP and STP.
Maximum number of VSTP instances supported is 128.
Maximum number of MSTP instances supported is 64.
Maximum number of RSTP instances supported is 1.
Maximum number of STP instances supported is 1.
The ACX Series routers supports enabling Spanning-Tree Protocol (STP), Rapid
Spanning-Tree Protocol (RSTP), Multiple Spanning-Tree Protocol (MSTP), and VLAN
Spanning-Tree Protocol (VSTP) on aggregated Ethernet interface .
For more information about the various versions of spanning-tree protocols, see the
appropriate IEEE specification.
Layer 2 Protocol Tunneling on ACX Series Overview on page 437
Configuring Rapid Spanning-Tree Protocol on page 411
Configuring Multiple Spanning-Tree Protocol on page 413
Configuring VLAN Spanning-Tree Protocol on page 417
Bridge Priority for Election of Root Bridge and Designated Bridge on page 406
Spanning-Tree Instance Interface on page 407
Spanning-Tree Instance Interface Priority on page 408
Spanning-Tree Instance Interface Cost on page 408
Spanning-Tree Instance Interface Point-to-Point Link Mode on page 409
Configuring a Spanning-Tree Instance Interface as an Edge Port for Faster Convergence
on page 409
Spanning-Tree Protocol Trace Options on page 410
Chapter 12: Configuring Layer 2 Control Protocol
with a protocol type of 0x010b . VSTP BPDUs are tunneled
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