Pilla Zamindar Posted September 27, 2011 Report Posted September 27, 2011 [quote author=k2s link=topic=243110.msg3040613#msg3040613 date=1317158289]naa profile lo topics lo vethuku baa... else for some time ..... after the class , will PM u the links[/quote]ne profile lo posts vetukutey anni kastam baa....roju ki 15 pages vuntaunayi...after class naku pm chesina parla thank u.. Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 [quote author=k2s link=topic=243110.msg3040577#msg3040577 date=1317157852]Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three)[img]http://www.9tut.com/images/ccna/STP/STP_designated_port.jpg[/img]A. Switch A – Fa0/0 B. Switch A – Fa0/1 C. Switch B – Fa0/0 D. Switch B – Fa0/1 E. Switch C – Fa0/0 F. Switch C – Fa0/1[/quote]answer : First by comparing their MAC addresses we learn that switch B will be root bridge as it has lowest MAC. Therefore all of its ports are designated ports -> C & D are correct.On the link between switch A & switch C there must have one designated port and one non-designated (blocked) port. We can figure out which port is designated port by comparing their MAC address again. A has lower MAC so Fa0/1 of switch A will be designated port while Fa0/1 of switch C will be blocked -> B is correct. Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 [quote author=Pilla Zamindar link=topic=243110.msg3040621#msg3040621 date=1317158417]ne profile lo posts vetukutey anni kastam baa....roju ki 15 pages vuntaunayi...after class naku pm chesina parla thank u..[/quote]posts lo kadu...... topics aney tab lo chudu Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 [quote author=shakkku link=topic=243110.msg3040611#msg3040611 date=1317158245]switch B thakuva MAC undi kabati adi root avuthundi, so daani ports root ports avuthai, switch A MAC switch C kana ekuva undi kabati veetivi desg ports avuthai, correct ena sCo_^Y sCo_^Y sCo_^Y[/quote] @3$% @3$%confuse ayyavu...... top switch is B not A........ Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 [quote author=k2s link=topic=243110.msg3040608#msg3040608 date=1317158201]Which is what :[img]http://www.certprepare.com/images/SWITCH/DragAndDrop/STP_process.jpg[/img][/quote]answer : 1) Listening: sends and receives BPDUs to determine root, but does not update the MAC address table.2) Disabled: does not participate in frame forwarding or in STP.3) Blocking: does not participate in frame forwarding.4) Fowarding: sends and receives data frames.5) Learning: populates the MAC address table, but will not forward user data.Notice: A port begins its life in a Disabled state, moving through several passive states and, finally, into an active state if allowed to forward traffic. Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 [quote author=shakkku link=topic=243110.msg3040579#msg3040579 date=1317157875]STP okate anukunta[/quote]STP is IEEE 802.1D ^G#Wso A & D Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 Ok guys...... I am continuing with next topic.... RSTP:Rapid STP (IEEE 802.1w)RSTP (802.1w) works just like STP (802.1d) in several ways:■ It elects the root switch using the same parameters and tiebreakers.■ It elects the root port on nonroot switches with the same rules.■ It elects designated ports on each LAN segment with the same rules.■ It places each port in either Forwarding or Blocking State, although RSTP calls the Blocking State the Discarding State.the reason to go RSTP is convergence. STP takes a relatively long time toconverge (50 seconds with the default settings). RSTP improves network convergencewhen topology changes occur. Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 RSTP improves convergence by either eliminating or significantly reducing the waitingperiods that 802.1d STP needs to avoid loops during convergence. 802.1d STP requires awaiting period of MaxAge (default 20 seconds) before reacting to some events, whereasRSTP only has to wait 3*Hello (default 6 seconds). Additionally, RSTP eliminates theforward delay (default 15 seconds) time in both Listening and Learning States. TraditionalSTP convergence has essentially three time periods, each of which RSTP improves upon.These three waiting periods of (by default) 20, 15, and 15 seconds create 802.1d STP’srelatively slow convergence, and the reduction or elimination of these waiting periodsmakes RSTP convergence occur quickly.RSTP convergence times are typically less than 10 seconds. In some cases, they can be aslow as 1 to 2 seconds. The following sections explain the terminology and processes usedby RSTP to overcome the shortcomings of 802.1d STP and improve convergence time. Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 RSTP and STP Port StatesOperational State STP State (802.1d) RSTP State Forwards Data Frames in This State? (802.1w) Enabled Blocking Discarding NoEnabled Listening Discarding NoEnabled Learning Learning NoEnabled Forwarding Forwarding YesDisabled Disabled Discarding No Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 RSTP and STP Port RolesRSTP Role STP Role DefinitionRoot port Root port A single port on each nonroot switch in which the switch hears the best BPDU out of all the received BPDUsDesignated port Designated port Of all switch ports on all switches attached to the same segment/collision domain, the port that advertises the “best” BPDUAlternate port — A port on a switch that receives a suboptimal BPDUBackup port — A nondesignated port on a switch that is attached to the same segment/collision domain as another port on the same switchDisabled — A port that is administratively disabled or is not capable of working for other reasons Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 4 Members and 3 Guests are viewing this topic.andulo okadini nenu &*B@ Quote
CaliStar Posted September 27, 2011 Report Posted September 27, 2011 [quote author=k2s link=topic=243110.msg3040673#msg3040673 date=1317159706]4 Members and 3 Guests are viewing this topic.andulo okadini nenu &*B@[/quote] F@#da F@#da Quote
k2s Posted September 27, 2011 Author Report Posted September 27, 2011 any doubts.... [img]http://lh3.ggpht.com/-p1xL5q8Ux-4/TmBT970zOXI/AAAAAAAAD-A/rj1T9vsNltw/Ali.gif[/img] Quote
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