
C
HAPTER
33
| UniDirectional Link Detection Commands
– 1080 –
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 ECS4110-28T
Страница 1: ...Management Guide www edge core com ECS4110 28T 28P 52T 52P 28 52 Port Gigabit Ethernet Layer 2 Switch...
Страница 2: ......
Страница 4: ......
Страница 63: ...FIGURES 63 Figure 428 Configuring VLAN Translation 1177...
Страница 64: ...FIGURES 64...
Страница 72: ...TABLES 72...
Страница 74: ...SECTION I Getting Started 74...
Страница 102: ...SECTION II Web Configuration 102 General IP Routing on page 679...
Страница 154: ...CHAPTER 4 Basic Management Tasks Resetting the System 154...
Страница 198: ...CHAPTER 5 Interface Configuration VLAN Trunking 198 Figure 65 Configuring VLAN Trunking...
Страница 272: ...CHAPTER 9 Congestion Control Automatic Traffic Control 272...
Страница 286: ...CHAPTER 10 Class of Service Layer 3 4 Priority Settings 286...
Страница 420: ...CHAPTER 13 Security Measures DHCP Snooping 420...
Страница 566: ...CHAPTER 14 Basic Administration Protocols OAM Configuration 566...
Страница 638: ...CHAPTER 15 Multicast Filtering Multicast VLAN Registration for IPv6 638...
Страница 662: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 662...
Страница 678: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 678...
Страница 792: ...CHAPTER 21 System Management Commands Switch Clustering 792...
Страница 822: ...CHAPTER 23 Remote Monitoring Commands 822...
Страница 888: ...CHAPTER 24 Authentication Commands PPPoE Intermediate Agent 888...
Страница 968: ...CHAPTER 25 General Security Measures Port based Traffic Segmentation 968...
Страница 994: ...CHAPTER 26 Access Control Lists ACL Information 994...
Страница 1034: ...CHAPTER 28 Link Aggregation Commands Trunk Status Display Commands 1034...
Страница 1044: ...CHAPTER 29 Power over Ethernet Commands 1044...
Страница 1084: ...CHAPTER 33 UniDirectional Link Detection Commands 1084...
Страница 1090: ...CHAPTER 34 Address Table Commands 1090...
Страница 1194: ...CHAPTER 37 VLAN Commands Configuring Voice VLANs 1194...
Страница 1388: ...CHAPTER 42 CFM Commands Delay Measure Operations 1388...
Страница 1410: ...CHAPTER 44 Domain Name Service Commands 1410...
Страница 1420: ...CHAPTER 45 DHCP Commands DHCP Relay 1420...
Страница 1472: ...CHAPTER 46 IP Routing Commands IPv4 Commands 1472...
Страница 1474: ...SECTION IV Appendices 1474...
Страница 1502: ...COMMAND LIST 1502...
Страница 1513: ......
Страница 1514: ...ECS4110 28T ECS4110 28P ECS4110 52T ECS4110 52P E072014 ST R02 150200000929A...