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Chapter 7 Configuring the Cisco Discovery Protocol
Setting the CDP Transmission Rate
7-4
Cisco Content Services Switch Routing and Bridging Configuration Guide
OL-8241-02
Setting the CDP Transmission Rate
By default, the frequency at which the CSS transmits CDP packets to all receiving
CDP-compatible devices is 60 seconds. To specify the frequency at which the CSS
transmits CDP packets to all receiving CDP-compatible devices, use the cdp
timer global configuration command. Valid entries are 5 to 254 seconds.
To change the CDP transmission rate for the CSS to 120 seconds, enter:
(config)# cdp timer 120
To reset the CDP timer to the default rate of 60 seconds, enter:
(config)# no cdp timer
Showing CDP Information
Use the show cdp command to display and verify CDP information for the CSS,
such as frequency of transmissions and the hold time for transmitted CSS CDP
information.
For example:
(config)# show cdp
Global CDP information:
Sending CDP packets every 60 seconds
Sending a holdtime value of 16 seconds
TimeLastCdpSent: 0 days 00:00:30
The following example illustrates the CDP output on a Cisco Catalyst 8540 router
using the Cisco IOS show cdp neighbors command.
24-8540-1>show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H -
Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
00-10-58-01-4d-e3 Eth 0 178 R T S CSS 11050 Eth-Mgmt
SCA043801A5 Eth 0 144 T S WS-C6009 3/1
25-8540-1 Fas 0/0/7 142 R T C8540CSR Fas 0/0/4
25-8540-1 Eth 0 142 R T C8540CSR Eth 0
SCA043801HU(bxb11 Eth 0 151 T S WS-C6009 2/48
00-07-85-43-14-1d Eth 0 170 R T S CSS11503 Eth-Mgmt
- Software Version 8.20 1
- November 2006 1
- CONTENTS 3
- Contents 10
- OL-8241-02 10
- Audience 16
- How to Use This Guide 16
- Related Documentation 17
- Symbols and Conventions 20
- Obtaining Documentation 21
- Documentation Feedback 22
- Submitting a Service Request 26
- • Transmit untagged packets 30
- Configuring Interfaces 34
- Configuring an Interface 35
- Interface 42
- • Enabling Port Fast 44
- • Enabling BPDU Guard 44
- Enabling Port Fast 45
- Enabling BPDU Guard 45
- Showing Port Fast Information 46
- Showing Bridge Configurations 47
- Showing Interface Information 50
- Showing Interface Statistics 52
- # clear statistics 54
- -32 suffix 55
- Shutting Down an Interface 57
- Shutting Down All Interfaces 57
- Restarting an Interface 58
- Restarting All Interfaces 58
- Configuring Circuits 59
- Showing Circuits 65
- Showing IP Interfaces 66
- Configuring RIP Send Version 68
- # show rip globals 70
- # show rip statistics 71
- Configuring SPAN on a CSS 74
- SPAN Configuration 75
- OSPF Overview 86
- OSPF Routing Hierarchy 87
- Autonomous System 88
- Backbone Area 88
- Area Border Routers 89
- Stub Area 89
- Link-State Databases 90
- Verifying Your Configuration 95
- Enabling OSPF 97
- Configuring an Area 97
- Configuring Equal-Cost Routes 98
- Configuring OSPF on the CSS 100
- • Setting the Cost 108
- • Setting the Password 108
- • Setting the Poll Interval 108
- Setting the Cost 109
- Setting the Password 110
- Setting the Poll Interval 111
- Showing OSPF Information 113
- Showing Global Statistics 114
- # show ospf interfaces 115
- Showing Link-State Databases 118
- # show ospf lsdb 119
- Showing ASE Entries 121
- # show ospf redistribute 123
- Showing OSPF Neighbors 124
- Protocol 129
- ARP Configuration Quick Start 130
- Configuring ARP 131
- Table for a MAC Down Event 132
- Configuring ARP Timeout 132
- Configuring ARP Wait 133
- Updating ARP Parameters 133
- Clearing ARP Parameters 133
- Showing ARP Information 134
- RIP Configuration Quick Start 140
- Configuring RIP Advertise 141
- Configuring RIP Redistribute 141
- Showing RIP Configurations 143
- IP Configuration Quick Start 148
- Configuring an IP Route 149
- Next Hop 152
- • Showing IP Statistics 159
- # show ip routes 162
- Showing IP Statistics 163
- TCP Statistics 164
- ICMP Statistics 165
- ARP Statistics 166
- Resetting IP Statistics 167
- CDP Configuration Quick Start 170
- Enabling CDP 171
- Setting the CDP Hold Time 171
- Showing CDP Information 172
- Messages 176
- Command (continued) 177
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