Exp-computer PathBuilder S200 Uživatelský manuál Strana 97
- Strana / 162
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Bridging 93
T0008-16F Release 5.2M
Spanning Tree Protocol Entity (STPE)
Other
Considerations for
Selecting Links
There are two final considerations when selecting links on the basis of reported cost,
when the costs and indicated root bridge on different links are the same. The first is
the case where, for example, B4 receives a message on link 8 from B3 designating
B1 as the root bridge with a cost of 10608 to the root. At the same time, B4 receives
a message on link 8 from B2 designating B1 as the root bridge with a cost of 7072.
In this case, B4 will select link 7 as the root link because the spanning tree algorithm
dictates that if more than one message has the same root bridge indicated, at the same
cost to the root, then the message with the higher priority-reporting adjacent should
be given priority. In this case, B2 has been configured to have a higher priority
(lower Bridge ID) than B3, so B4 selects link 7 as its root link.
The second consideration occurs when two links on the same bridge are receiving
messages from the same adjacent bridge, and the messages report the same root
bridge and the same cost to the root bridge. This could occur if there were two links
between B3 and B4. The bridge will choose the link with the lower bridge link
priority. The priority for the link is a 2-byte number formed by concatenating the
value of the parameter STPE Priority with the link number.
Figure 46. Two Bridge Links Between B3 and B4
For example, B3 sends messages to B4 that the root bridge is B1, and that the cost to
the root is 10608 (3536+3536). To cause bridge 4 to favor link 11 over link 8,
configure:
link 8: STPE Priority = 128 (80 hex)
link 11: STPE Priority = 64 (40 hex)
In this example, should a link between bridge 3 and bridge 4 be necessary for a
spanning tree, bridge 4 will favor link 11 and remove link 8 from the tree.
Bridge 3
Bridge 4
67
1
9
10
1
8
LAN 3
LAN 4
11
- Corporation 1
- Restricted Rights Legend 2
- Notice (continued) 3
- Bridging 5
- Overview 5
- 2 Bridging 6
- Bridging 3 7
- (continued) 8
- Application 9
- Ethernet LAN 10
- Bridging 7 11
- Mixed LAN Bridging 12
- MAC Addressing 13
- Bridging 11 15
- Filtering 16
- Spanning Tree Protocol 17
- Dual Ethernet LANs 18
- Bridging 15 19
- 16 Bridging 20
- Bridging 17 21
- 18 Bridging 22
- Bridging 19 23
- 20 Bridging 24
- Operation 25
- Bridge Parameters 26
- Bridging 23 27
- Bridging 25 29
- Bridge Link Parameters 30
- Bridging 27 31
- 28 Bridging 32
- Bridging 29 33
- 30 Bridging 34
- LAN Connection Table 35
- 32 Bridging 36
- Bridging 33 37
- 34 Bridging 38
- Limiting Bridge Frame Sizes 39
- 36 Bridging 40
- Bridging 37 41
- 38 Bridging 42
- Bridge Frame Handling 43
- Switch LAN Network 44
- Bridging 41 45
- 42 Bridging 46
- Frame to the Bridge Module 48
- Bridging 45 49
- 46 Bridging 50
- If... Then 51
- 48 Bridging 52
- Bridging 49 53
- 50 Bridging 54
- Bridging 51 55
- 52 Bridging 56
- Bridging 53 57
- Using Filters 58
- Bridging 55 59
- 56 Bridging 60
- Bridge Filtering 61
- MAC Address Filtering 62
- Parameter Action (continued) 63
- Parameter 63
- MAC Filtering 64
- Address Frames 66
- Parameter Values 66
- MAC Wildcard Filtering 69
- Protocol Filtering 74
- Protocol SAP (hex value) 76
- Protocol OUI/IP (hex value) 76
- Figure 38. SNAP Protocol ID 78
- Parameter Action(s) 79
- NetBIOS Name Filtering 80
- Step Action 82
- NetBIOS Packet Formats 89
- Configuration 90
- Bridging 87 91
- 88 Bridging 92
- Bridging 89 93
- 80-00 08-00-3E-02-53-8F 94
- MAC Address 94
- Bridge Priority 94
- Bridging 91 95
- 92 Bridging 96
- Bridging 93 97
- 94 Bridging 98
- Spanning Tree Timers 99
- 96 Bridging 100
- Bridge Forward Delay Timer 101
- 98 Bridging 102
- Bridging 99 103
- LLC2 Local Termination 104
- Type Name Description 107
- Local Termination spoofs: 108
- Configuring Local Termination 110
- (continued) 113
- Step Action Result 117
- Mixed LAN Operation 118
- Dual LAN Ethernet 121
- LAN Server Subsystem 124
- Statistics and 125
- Configuring the LSS Record 126
- Bridge Statistics 128
- Spanning Tree Statistics 129
- Term (continued) Description 130
- Term Description 132
- Bridge Link Filter Summary 134
- Term Description (continued) 139
- LAN Connection Statistics 140
- LAN Bridge Conn. Remote 144
- 1 Waiting 5 Configured SVC 144
- Heading Description 145
- Sample of Detailed 147
- Session Statistics 147
- Local Station Session Summary 149
- Reset Statistics 151
- Appendix A 153
- A-2 Technical Support 154
- Technical Support A-3 155
- A-4 Technical Support 156
Baumatic BE600GL manuali
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