December 2005
Intermediate to advanced
1066 pages
33h 38m
English
Content preview from Understanding Linux Network Internals
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Enabling and Disabling a Bridge Device
We saw in the
section "Bridge Device Setup Routine"
how dev->open and dev->stop are initialized for bridge devices, and we saw in the section
"Enabling and Disabling a Network
Device" in Chapter 8 how administrative
commands to enable and disable a network device are processed by dev_open and dev_close.
br_dev_open enables a bridge by:
Initializing the bridge device features to the minimal, common subset of the features supported by its enslaved devices with
br_features_recomputeEnabling the device for transmission with
netif_start_queue(see the section "Enabling and Disabling Transmissions" in Chapter 11)Enabling the bridge device with
br_stp_enable_bridge
When you enable a bridge device, any port that had previously been enslaved to it would also be enabled.
br_dev_stop is just the mirror image of br_dev_open, as shown in Figure 16-9.
Figure 16-9. (a) Enabling a bridge; (b) disabling a bridge
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