
C
HAPTER
36
| UniDirectional Link Detection Commands
– 1266 –
If the link is deemed anything other than bidirectional at the end of the
detection phase, this curve becomes a flat line with a fixed value of Mfast
(7 seconds).
If the link is instead deemed bidirectional, the curve will use Mfast for the
first four subsequent message transmissions and then transition to an
Mslow value for all other steady-state transmissions. Mslow is the value
configured by this command.
E
XAMPLE
This example sets the message interval to 10 seconds.
Console(config)#udld message-interval 10
Console(config)#
udld aggressive
This command sets UDLD to aggressive mode on an interface. Use the
no
form to restore the default setting.
S
YNTAX
[
no
]
udld aggressive
D
EFAULT
S
ETTING
Disabled
C
OMMAND
M
ODE
Interface Configuration (Ethernet Port)
C
OMMAND
U
SAGE
UDLD can function in two modes: normal mode and aggressive mode.
◆
In normal mode, determination of link status at the end of the
detection process is always based on information received in UDLD
messages: whether that’s information about the exchange of proper
neighbor identification or the absence of such. Hence, albeit bound by a
timer, normal mode determinations are always based on gleaned
information, and as such are “event-based.” If no such information can
be obtained (e.g., because of a bidirectional loss of connectivity), UDLD
follows a conservative approach minimize false positives during the
detection process and deems a port to be in “undetermined” state. In
other words, normal mode will shut down a port only if it can explicitly
determine that the associated link is faulty for an extended period of
time.
◆
In aggressive mode, UDLD will also shut down a port if it loses
bidirectional connectivity with the neighbor for the same extended
period of time (as that mentioned above for normal mode) and
subsequently fails repeated last-resort attempts to re-establish
communication with the other end of the link. This mode of operation
assumes that loss of communication with the neighbor is a meaningful
network event in itself, and a symptom of a serious connectivity
Содержание ECS4660-28F
Страница 1: ...Management Guide www edge core com ECS4660 28F Layer 3 Gigabit Ethernet Switch...
Страница 2: ......
Страница 4: ......
Страница 12: ...ABOUT THIS GUIDE 12...
Страница 64: ...CONTENTS 64...
Страница 90: ...TABLES 90...
Страница 92: ...SECTION I Getting Started 92...
Страница 122: ...SECTION II Web Configuration 122 Multicast Routing on page 825...
Страница 148: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 148...
Страница 224: ...CHAPTER 5 Interface Configuration VLAN Trunking 224 Figure 68 Configuring VLAN Trunking...
Страница 262: ...CHAPTER 6 VLAN Configuration Configuring VLAN Translation 262...
Страница 304: ...CHAPTER 9 Congestion Control Automatic Traffic Control 304...
Страница 340: ...CHAPTER 11 Quality of Service Attaching a Policy Map to a Port 340...
Страница 452: ...CHAPTER 13 Security Measures DHCP Snooping 452...
Страница 740: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 740...
Страница 866: ...CHAPTER 21 Multicast Routing Configuring PIMv6 for IPv6 866...
Страница 882: ...CHAPTER 22 Using the Command Line Interface CLI Command Groups 882...
Страница 1024: ...CHAPTER 26 Remote Monitoring Commands 1024...
Страница 1030: ...CHAPTER 27 Flow Sampling Commands 1030...
Страница 1088: ...CHAPTER 28 Authentication Commands PPPoE Intermediate Agent 1088...
Страница 1162: ...CHAPTER 29 General Security Measures Configuring Port based Traffic Segmentation 1162...
Страница 1186: ...CHAPTER 30 Access Control Lists ACL Information 1186...
Страница 1214: ...CHAPTER 31 Interface Commands Transceiver Threshold Configuration 1214...
Страница 1238: ...CHAPTER 33 Port Mirroring Commands RSPAN Mirroring Commands 1238...
Страница 1258: ...CHAPTER 34 Congestion Control Commands Automatic Traffic Control Commands 1258...
Страница 1270: ...CHAPTER 36 UniDirectional Link Detection Commands 1270...
Страница 1276: ...CHAPTER 37 Address Table Commands 1276...
Страница 1336: ...CHAPTER 39 ERPS Commands 1336...
Страница 1386: ...CHAPTER 40 VLAN Commands Configuring Voice VLANs 1386...
Страница 1406: ...CHAPTER 41 Class of Service Commands Priority Commands Layer 3 and 4 1406...
Страница 1424: ...CHAPTER 42 Quality of Service Commands 1424...
Страница 1536: ...CHAPTER 43 Multicast Filtering Commands MLD Proxy Routing 1536...
Страница 1602: ...CHAPTER 45 CFM Commands Delay Measure Operations 1602...
Страница 1624: ...CHAPTER 47 Domain Name Service Commands 1624...
Страница 1646: ...CHAPTER 48 DHCP Commands DHCP Server 1646...
Страница 1974: ...SECTION IV Appendices 1974...
Страница 1980: ...APPENDIX A Software Specifications Management Information Bases 1980...
Страница 2020: ...ECS4660 28F E102013 ST R03 149100000140A...