user manual
Table Of Contents
- Cisco Content Services Switch Routing and Bridging Configuration Guide
- Contents
- Preface
- Configuring Interfaces and Circuits
- Interface and Circuit Overview
- Configuring Interfaces
- Configuring an Interface
- Entering a Description for the Interface
- Configuring Interface Duplex and Speed
- Setting Interface Maximum Idle Time
- Bridging an Interface to a VLAN
- Specifying VLAN Trunking for an Interface
- Configuring Spanning-Tree Bridging for a VLAN or a Trunked Interface
- Configuring Port Fast on an Interface
- Showing Interface Configurations
- Shutting Down an Interface
- Shutting Down All Interfaces
- Restarting an Interface
- Restarting All Interfaces
- Configuring Circuits
- Configuring RIP for an IP Interface
- Configuring the Switched Port Analyzer Feature
- Configuring Spanning-Tree Bridging for the CSS
- CSS Spanning-Tree Bridging Quick Start
- Configuring Spanning-Tree Bridge Aging-Time
- Configuring Spanning-Tree Bridge Forward-Time
- Configuring Spanning-Tree Bridge Hello-Time
- Configuring Spanning-Tree Bridge Max-Age
- Configuring Spanning-Tree Bridge Priority
- Disabling Bridge Spanning-Tree
- Showing Bridge Configurations
- Configuring Open Shortest Path First (OSPF)
- OSPF Overview
- CSS OSPF Configuration Quick Start
- Configuring OSPF on the CSS
- Configuring OSPF on a CSS IP Interface
- Showing OSPF Information
- OSPF Configuration in a Startup-Configuration File
- Configuring the Address Resolution Protocol
- Configuring Routing Information Protocol
- Configuring the Internet Protocol
- IP Configuration Quick Start
- Configuring an IP Route
- Disabling an Implicit Service for the Static Route Next Hop
- Configuring an IP Source Route
- Configuring the IP Record Route
- Configuring Box-to-Box Redundancy
- Configuring IP Equal-Cost Multipath
- Forwarding IP Subnet Broadcast Addressed Frames
- Configuring IP Unconditional Bridging
- Configuring IP Opportunistic Layer 3 Forwarding
- Showing IP Configuration Information
- Configuring the Cisco Discovery Protocol
- Configuring the DHCP Relay Agent
- Index
CHAPTER
2-1
Cisco Content Services Switch Routing and Bridging Configuration Guide
OL-4580-01
2
Configuring Spanning-Tree Bridging
for the CSS
The CSS supports configuration of Spanning-Tree Protocol (STP) bridging.
Spanning-tree bridging detects, and then prevents, loops in the network. Use the
bridge command to configure global spanning-tree bridging options for the CSS,
such as bridge aging time, forward delay time, hello time interval, and maximum
age. Make sure you configure the spanning-tree bridging parameters the same on
all switches running STP in the network.
Note When connecting a Cisco Catalyst switch to a CSS using an 802.1Q trunk and the
STP, the Catalyst runs a spanning-tree instance for each VLAN. When you
configure an 802.1Q trunk on an Ethernet interface for the Catalyst switch, the
bridge protocol data units (BPDUs) are tagged with the corresponding VLAN ID
and the destination MAC address changes from the standard 01-80-C2-00-00-00
to the proprietary 01-00-0c-cc-cc-cd. This modification allows Cisco switches
operating in a non-Cisco (a mix of other vendors) 802.1Q trunk environment to
maintain spanning-tree states for all VLANs. Although the CSS maintains a
spanning-tree instance for each VLAN as well, the CSS uses the standard
01-80-C2-00-00-00 destination MAC address for all BPDUs (tagged or
untagged). When you connect a Cisco Catalyst switch to a CSS over an 802.1Q
trunk, the result is that neither switch recognizes the other's BPDUs, and both
assume root status. If a spanning-tree loop is detected, the Catalyst switch goes
into blocking mode on one of its looped ports.