Understanding Bpdu Protection For Spanning-Tree Instance Interfaces - Juniper ACX1000 Configuration Manual

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Understanding BPDU Protection for Spanning-Tree Instance Interfaces

Copyright © 2017, Juniper Networks, Inc.
}
protocols {
(mstp | rstp | vstp) {
traceoptions { # Spanning-tree protocol-specific.
file filename <files number> <size bytes> <world-readable | no-world-readable>;
flag flag <flag-modifier> <disable>;
}
}
}
...
Layer 2 Control Protocol on ACX Series Routers on page 404
Configuring Rapid Spanning-Tree Protocol on page 411
Configuring Multiple Spanning-Tree Protocol on page 413
Disabling MSTP on page 417
Configuring MST Instances on a Physical Interface on page 415
Configuring VLAN Spanning-Tree Protocol on page 417
By default, if a bridge protocol data unit (BPDU) data frame is received on a blocked
interface, the system will disable the interface and stop forwarding frames out the
interface until the interface is explicitly cleared.
The Spanning Tree Protocol (STP) family is designed to break possible loops in a Layer 2
bridged network. Loop prevention avoids damaging broadcast storms that can potentially
render the network useless. STP processes on bridges exchange BPDUs to determine
the LAN topology, decide the root bridge, stop forwarding on some ports, and so on.
However, a misbehaving user application or device can interfere with the operation of
the STP protocols and cause network problems.
On the ACX Series routers, MX Series routers, and EX Series switches only, you can
configure BPDU protection to ignore BPDUs received on interfaces where none should
be expected (for example, a LAN interface on a network edge with no other bridges
present). If a BPDU is received on a blocked interface, the interface is disabled and stops
forwarding frames. By default, all BPDUs are accepted and processed on all interfaces.
You can configure BPDU protection on interfaces with the following encapsulation types:
ethernet-bridge
ethernet-vpls
extended-vlan-bridge
vlan-vpls
vlan-bridge
extended-vlan-vpls
Chapter 12: Configuring Layer 2 Control Protocol
423