the spanning tree protocol

... ports have transitioned to either the forwarding or the blocking state • When the network topology changes, switches and bridges must recompute the Spanning- Tree Protocol, which disrupts user ... occurs to the network topology, STP maintains connectivity by transitioning some blocked ports to the forwarding state • RSTP significantly speeds the recalculation of the spanning tree when the network ... v2.0—3-7 Spanning- Tree Port States (Cont.) © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-8 Spanning- Tree Path Cost © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-9 Spanning- Tree...

Ngày tải lên: 08/07/2013, 01:27

... ports have transitioned to either the forwarding or the blocking state • When the network topology changes, switches and bridges must recompute the Spanning- Tree Protocol, which disrupts user ... occurs to the network topology, STP maintains connectivity by transitioning some blocked ports to the forwarding state • RSTP significantly speeds the recalculation of the spanning tree when the network ... v2.0—3-7 Spanning- Tree Port States (Cont.) © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-8 Spanning- Tree Path Cost © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-9 Spanning- Tree...

Ngày tải lên: 17/02/2014, 08:20

... instability Spanning tree Lớp trường TTL (Time to Live) Spanning tree : Cho phép tạo cấu trúc luận lý không vòng lặp vòng lặp vật lý TREE TREE : cấu trúc logic hình hình mở rộng Thuật toán Spanning tree ... chuyển trạng thái Thời gian hội tụ không lâu 15s Rapid spanning tree (IEEE 802.1w) thực thay spanning tree (IEEE 802.1d) 13 Rapid Spanning Tree Protocol (RSTP) 14 ... port bắt đầu truyền liệu user, học địa MAC xử lí gói BPDU 12 Rapid Spanning Tree Protocol (RSTP) Giao thức Rapid spanning – tree theo chuẩn IEEE 802.1w : Làm rõ vai trò trạng thái port Định nghĩa...

Ngày tải lên: 04/04/2014, 00:01

... BPDU frame, they compare the root ID from the BPDU frame with the local root ID – If the root ID in the BPDU is lower than the local root ID, the switch updates the local root ID and the ID in ... forwarding and the switch has a designated port When a change is detected, the switch notifies the root bridge of the spanning tree The root bridge then broadcasts the information into the whole network ... determining the root port on a switch, the switch compares the path costs on all switch ports participating in the spanning tree The switch port with the lowest overall path cost to the root is...

Ngày tải lên: 05/07/2014, 03:20

... the switches in spanning tree debug mode using the command debug spanningtree events S1#debug spanning- tree events Spanning Tree event debugging is on S2#debug spanning- tree events Spanning Tree ... at the beginning of the lab Task 4: Configure Spanning Tree Step 1: Examine the default configuration of 802.1D STP On each switch, display the spanning tree table with the show spanning- tree ... Which switch is the root for the VLAN spanning tree? S1 (may vary) Which spanning tree ports are in the blocking state on the root switch? _none Do either of the non-root switches...

Ngày tải lên: 05/07/2014, 04:20

... link down Via Spanning Tree Protocol Học viện mạng Bách Khoa - Website: www.bkacad.com 19 Spanning Tree Protocol p g Học viện mạng Bách Khoa - Website: www.bkacad.com 20 The Spanning Tree Algorthm ... Verify the BID Học viện mạng Bách Khoa - Website: www.bkacad.com 28 Best Paths to the Root Bridge • When the root bridge has been designated for the spanning- tree instance, the STA starts the process ... 23 The Root Bridge • Every spanning- tree instance (switched LAN or broadcast domain) has a switch designated as the root bridge The root bridge serves as a reference point for all spanning tree...

Ngày tải lên: 28/07/2014, 18:21

... dựng spanning tree • Các Bridge chạy thuật toán phân phối spanning tree (STA) • Chọn cổng nào, bridge nên thực chuyển tiếp khung Cổng nào, bridge nên tắt Tổng quan STP • Xây dựng Spanning Tree ... /*destination is on LAN on which frame was received */ then drop the frame otherwise (out_port is valid) /*entry found for destination */ then forward the frame on interface indicate Ví dụ trình “học” ... designated port Xây dựng ST LAN segment B8 Spanning Tree: B3 B5 B1 root port B7 B2 B2 B4 B5 B1 Root B6 B3 B4 B8 B6 B7 Example Spanning Tree B8 Forwarding Tree: B3 B5 B1 root B7 port B2 B2 B4 B5...

Ngày tải lên: 31/10/2014, 22:00

... mechanism to stop the loop Solution: Spanning- Tree Protocol x Block Provides a loop free redundant network topology by placing certain ports in the blocking state Spanning- Tree Operations • One ... figure out: • What is the root bridge? • What are the designated, nondesignated, and root parts? • Which are the forwarding and blocking ports? Spanning- Tree Port States Spanning- tree transitions ... when all the switch and bridge ports have transitioned to either the forwarding or blocking state • When network topology changes, switches and bridges must recompute the Spanning- Tree Protocol, ...

Ngày tải lên: 12/08/2015, 09:19

... be the cost of the minimum spanning tree when the edges of the complete graph Kn have costs selected independently and uniformly at random in the interval [0, 1] Then, for any constant ε < 1, there ... and then assigning the polarity of additional vertices in the order given by a breadth-first search of the minimum spanning tree. ) If this function is the one that comes up, then the expected cost ... + − the minimum spanning tree in the graph where edge e has weight min{Xe , Xe } Since this ψ(u)ψ(v) is a tree, there is a function ψ which assigns every vertex a polarity so that Xe is the minimum...

Ngày tải lên: 07/08/2014, 13:21

... bonds and stocks, and put the money either under their mattresses or into the safest U.S bonds they could find So the declines in Brazil and the other emerging markets became the transmission mechanism ... governed for the first time by the emotions of the people rather than the fists of the state From where we sit, none of this diminishes the promise offered a decade ago by the demise of the walledoff ... but stable The defining defense system of the Cold War was radar-to expose the threats coming from the other side of the wall The defining defense system of the globalization era is the X-ray...

Ngày tải lên: 30/11/2013, 19:03

... is the MAC address of the switch? _ d Which switch should be the root of the spanning tree for VLAN 1? Step Look at the spanning tree table on each switch a At the ... Switch_A#show spanning- tree brief b On Switch_B type show spanning- tree brief at the privileged EXEC mode prompt as follows: Switch_B#show spanning- tree brief Examine the command output and answer the ... Switch_A#show spanning- tree brief b On Switch_B type show spanning- tree brief at the privileged EXEC mode prompt as follows: Switch_B#show spanning- tree brief c What changes have taken place in the command...

Ngày tải lên: 11/12/2013, 14:15

... interface vlan c What is the MAC address of the switch? _ d Which switch should be the root of the spanning tree for VLAN 1? Step Look at the spanning tree table on each ... Switch_A#show spanning- tree brief b On Switch_B type show spanning- tree brief at the privileged exec mode prompt as follows: Switch_B#show spanning- tree brief c What changes have taken place in the command ... to the switch port LEDs? _ Step Look at the spanning tree table on each switch a Type the following on Switch_A at the privileged exec mode prompt Note: Type show spanning- tree...

Ngày tải lên: 11/12/2013, 14:15

... moment; then they shouted that the whole place re-echoed with their rejoicing; they danced round the Tree, and one present after the other was pulled off ‘What are they about?’ thought the Tree ... happen now!’ And the lights burned down to the very branches, and as they burned down they were put out one after the other, and then the children had permission to plunder the Tree So they fell upon ... the horses dragged them out of the wood Where did they go to? What became of them? In spring, when the swallows and the storks came, the Tree asked them, ‘Don’t you know where they have been taken?...

Ngày tải lên: 14/12/2013, 08:15

... the number of bits in a transmission unit that is included with the unit so the receiver can check to see whether the same number of bits arrived CIR (committed information rate): describes the ... get the data Frame: data structure that collectively represents the transmission stream (headers, data, and the trailer) and provides the information necessary for the correct delivery of the ... Interface: point in the system where the rules, control codes, formats, and information direction (as dictated by the protocol) are implemented Interior protocols: routing protocol used within/interior...

Ngày tải lên: 21/12/2013, 04:18

... should have the stream activated on the client before executing these commands This will give you the full effect of the troubleshooting information a Show the CAM entries in the DLSwitch The content ... channel h Set the spanning tree portfast option enabled on the 4006 for the port that will connect to our external router DLSwitch> (enable) set spantree portfast i 2/5 enable Enable CGMP on the switch ... compare it to the configuration at the end of the lab Don’t worry about little differences because the router will place a number of its own configuration commands in Configure the CORP with the following...

Ngày tải lên: 21/12/2013, 19:15

... Branch#show run e Set the PIM Rendezvous Point (RP) address The path to every receiver in the multicast group from the RP is the shortest path tree Assume the RP is the receiver of the multicast traffic ... the PIM Rendezvous Point (RP) address The path to every receiver in the multicast group from the RP is the shortest path tree Assume the RP is the receiver of the multicast traffic DLRouter(config)#ip ... channel h Set the spanning tree portfast option enabled on the 4006 for the port that will connect to our external router DLSwitch> (enable) set spantree portfast i 2/5 enable Enable CGMP on the switch...

Ngày tải lên: 21/12/2013, 19:15

... parties The third protocol focuses on the actual transport of the media (e.g., voice or video) The first signaling protocol was developed through the International Telecommunications Union (ITU-T) The ... wireless standard, called cdma2000 The 3GPP2 is in the process of adopting the 3GPP IMS framework, which means they also see the significance of SIP They refer to their IMS innovation as Multi-Media ... proprietary, and the phones and the system came from the same vendor If you liked the features of another vendor’s phone sets, you had to purchase their system to support those features There were...

Ngày tải lên: 17/01/2014, 06:20

... rising from the spot, and when these had passed, there stood the little brother, and he took the father and little Marleen by the hand; then they all three rejoiced, and went inside together and ... left, and the millstone round his neck, he flew right away to his father’s house The father, the mother, and little Marleen were having their dinner ’How lighthearted I feel,’ said the father, ‘so ... it she wrapped all the bones from under the table and carried them outside, and all the time she did nothing but weep Then she laid them in the green grass under the juniper- tree, and she had...

Ngày tải lên: 21/01/2014, 03:20

... Check again with the show spanning- tree command to make sure the priority has changed: ALSwitch#sh spanning- tree Spanning tree is executing the IEEE compatible Spanning Tree protocol Bridge Identifier ... DLSwitch1 is now the root of our spanning- tree The backup link is blocked at the other (non-root) end On ALSwitch: ALSwitch#sh spanning- tree int fa0/1 Interface Fa0/1 (port 13) in Spanning tree is FORWARDING ... (Other output deleted) 2/34 blocking 3019 32 disabled ALSwitch>sh spanning- tree Spanning tree is executing the IEEE compatible Spanning Tree protocol Bridge Identifier...

Ngày tải lên: 24/01/2014, 19:20

... parent/child features Their algorithm finds the best solution according to the Eisner algorithm and then searches for the single valid edge change that increases the tree score The algorithm iterates ... c–pos/p–pos/ggp–pos (where gp is the grandparent and ggp is the great grand-parent) Edge POS-tag to the left and right of the subtree, both inside and outside the subtree For example, say a subtree with parent ... the graph A constrained spanning tree for GY,Z (a tree covering all nodes in the graph) must satisfy: Y ⊆ A ⊆ E − Z Let A be the (constrained) solution to a (constrained) graph and let e be the...

Ngày tải lên: 20/02/2014, 12:20