Cisco Catalyst 3750 Software Configuration Guide

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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 33 Configuring Fallback Bridging
Configuring Fallback Bridging
Default Fallback Bridging Configuration
Table 33-1 shows the default fallback bridging configuration.
Fallback Bridging Configuration Guidelines
Up to 32 bridge groups can be configured on the switch.
An interface (an SVI or routed port) can be a member of only one bridge group.
Use a bridge group for each separately bridged (topologically distinct) network connected to the switch.
Creating a Bridge Group
To configure fallback bridging for a set of SVIs or routed ports, these interfaces must be assigned to
bridge groups. All interfaces in the same group belong to the same bridge domain. Each SVI or routed
port can be assigned to only one bridge group.
Note The protected port feature is not compatible with fallback bridging. When fallback bridging is enabled,
it is possible for packets to be forwarded from one protected port on a switch to another protected port
on the same switch if the ports are in different VLANs.
Beginning in privileged EXEC mode, follow these steps to create a bridge group and to assign an
interface to it. This procedure is required.
Table 33-1 Default Fallback Bridging Configuration
Feature Default Setting
Bridge groups None are defined or assigned to a port. No
VLAN-bridge STP is defined.
Switch forwards frames for stations that it has
dynamically learned
Enabled.
Spanning tree parameters:
• Switch priority
• Port priority
• Port path cost
• Hello BPDU interval
• Forward-delay interval
• Maximum idle interval
• 32768.
• 128.
• 10 Mbps: 100.
100 Mbps: 19.
1000 Mbps: 4.
• 2 seconds.
• 20 seconds.
• 30 seconds.

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing