What can be used to resolve bridging loops in a redundant network?
To solve the problem of bridging loops, a network engineer named Radia Perlman invented something called the Spanning Tree Protocol. Most network folks just call it Spanning Tree or, even more mercifully, STP. Spanning Tree resolves the problem of bridging loops, and on Cisco switches it’s enabled by default.
How do you stop a bridge from looping?
Bridge loops can be prevented by disabling the redundant path. A loop-free network is one in which no Layer 2 loops exist; therefore, the network cannot create Layer 2 broadcast storms or flooded unicast storms.
How to troubleshoot Ethernet bridging in Linux?
In the case of the Linux bridging module it is possible to inspect the content of this table using the brctl showmacs command: The output is typically of the form: The value of this information for troubleshooting is that it tells you whether any packets from a given machine are being processed by the bridge.
Why do I have difficulty troubleshooting bridging loops?
This can cause a severe drain on available bandwidth, and it can cause your network links to become intermittently unreliable. It is this intermittent nature that causes difficulty in troubleshooting the problem. In an effort to address bridging loops, the spanning tree protocol was developed many moons ago.
When does a bridging Loop occur in a network?
If there are two Layer 2 paths from a source to a destination, the possibility of a loop will always exist. In a bridged or switched LAN environment, a bridging loop occurs when there are multiple paths that can cause packets to continuously loop around your network.
Why does Ethernet bridging cause intermittent forwarding?
Intermittent forwarding usually has some form of intermittent connectivity as its root cause, however there are two ways in which the use of bridging can exacerbate what might otherwise have been a less serious problem: If STP is enabled then the spanning tree may become unstable due to the topology changing faster than the tree can converge.