STP Q

13 Oct 2010


      /??????

????????? ??? ????? ????????????? ???????, ? ?????? ??????? ?????????? ? 
????????, ??????? ?????????. ???? STP (?? rapid) ? ????????? ?????????:
/
??, ?? ????? ????????? ??? ? ?????? ;-)

/? ???? ????????? - root@sw5, ? ?????? ????????? ?? (sw2-sw1)@sw2. 
???????? ??????? ? ?????????:

1) ???? ? ??? ???? sw4-sw2, ?? sw4 ??????? TCN ? ??????? sw5 ? 
?????????, ??????????????, ??????? ???????? TCN, ??????? ???????? ? ??? 
?? ????, ? ???????? ??? ??????? ???????????? TCN:
/
_sw4(config-if)#shut
sw4(config-if)#_
*Oct 13 23:16:35.647: STP: VLAN0001 sent Topology Change Notice on Gi1/0/3*
Oct 13 23:16:35.647: %LINK-5-CHANGED: Interface GigabitEthernet1/0/1, 
changed state to administratively down
Oct 13 23:16:36.653: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
GigabitEthernet1/0/1, changed state to down

_sw5#_
Oct 13 23:16:35.644: STP: VLAN0001 rx BPDU: config protocol = ieee, 
packet from FastEthernet0/3  , linktype IEEE_SPANNING , enctype 2, 
encsize 17
Oct 13 23:16:35.644: STP: enc 01 80 C2 00 00 00 EC 44 76 F7 28 83 00 07 
42 42 03
Oct 13 23:16:35.644: STP: Data     00000080
Oct 13 23:16:35.644: STP: VLAN0001 Fa0/3:0000 00 80
*Oct 13 23:16:35.644: STP: VLAN0001 Topology Change rcvd on Fa0/3*
Oct 13 23:16:35.644: STP: *VLAN0001 Fa0/3 tx BPDU*: config protocol=ieee
     Data : 0000 00 00 *81* 6001EC30915E0F00 00000000 6001EC30915E0F00 
8005 0000 1400 0500 0F00

/????? sw2 ???????????? ? ????????????, ?? ???? ???????? TCN ? ??????? 
root (sw1->sw5), ??????? ?????????????? ????? ?? ??? ?? ????? - ??????? 
? ????? ?? sw1 ? ???? ?? ????????:/

Oct 13 23:16:40.711: STP: VLAN0001 rx BPDU: config protocol = ieee, 
packet from FastEthernet0/1  , linktype IEEE_SPANNING , enctype 2, 
encsize 17
Oct 13 23:16:40.711: STP: enc 01 80 C2 00 00 00 A4 0C C3 27 42 81 00 07 
42 42 03
Oct 13 23:16:40.719: STP: Data     00000080
Oct 13 23:16:40.719: STP: VLAN0001 Fa0/1:0000 00 80
*Oct 13 23:16:40.719: STP: VLAN0001 Topology Change rcvd on Fa0/1*
Oct 13 23:16:40.719: STP: *VLAN0001 Fa0/1 tx BPDU*: config protocol=ieee
     Data : 0000 00 00 *81* 6001EC30915E0F00 00000000 6001EC30915E0F00 
8003 0000 1400 0500 0F00

/2) ??, ???? ? ??? ???? sw4-sw5 (?????????? ?? ????, ? ????? ???????), 
?? sw5 ?? ???? ?? ??????? ? ????? ?? ??????? ?????, ? ???????? 
??????????? ?????? ????? ??? ???????? TCN ?? ??????? sw2->sw1:/

Oct 13 23:32:09.240: STP[1]: Generating TC trap for port FastEthernet0/3
Oct 13 23:32:09.248: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed 
state to down
Oct 13 *23:32:10*.246: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
FastEthernet0/3, changed state to down
Oct 13 *23:32:28*.643: STP: VLAN0001 rx BPDU: config protocol = ieee, 
packet from FastEthernet0/1  , linktype IEEE_SPANNING , enctype 2, 
encsize 17
Oct 13 23:32:28.643: STP: enc 01 80 C2 00 00 00 A4 0C C3 27 42 81 00 07 
42 42 03
Oct 13 23:32:28.643: STP: Data     00000080
Oct 13 23:32:28.643: STP: VLAN0001 Fa0/1:0000 00 80
Oct 13 23:32:28.643: STP: VLAN0001 Topology Change rcvd on Fa0/1
Oct 13 23:32:29.641: STP: VLAN0001 Fa0/1 tx BPDU: config protocol=ieee
     Data : 0000 00 00 81 6001EC30915E0F00 00000000 6001EC30915E0F00 
8003 0000 1400 0500 0F00

/?????? ?????????? ??? ? ???????????? ????????? ? 20 ?????? (??????????? 
???????? ????????), ???? sw2 ???????????? ? ??????? ????????????? Hello 
?? ????? sw5-sw4-sw2:/

Oct 13 23:32:09.609: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:11.152: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:13.157: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:15.162: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:17.167: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:19.172: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:21.177: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:23.181: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:25.186: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:27.191: STP: VLAN0001 heard root 32769-ec44.76f7.2880 on Fa0/1
Oct 13 23:32:27.611: STP: VLAN0001 new root port Fa0/2, cost 119
Oct 13 23:32:27.611: STP: VLAN0001 Fa0/2 -> listening
Oct 13 23:32:28.642: STP: VLAN0001 Topology Change rcvd on Fa0/1
Oct 13 23:32:28.642: STP: VLAN0001 sent Topology Change Notice on Fa0/2
Oct 13 23:32:42.618: STP: VLAN0001 Fa0/2 -> learning
Oct 13 23:32:57.625: STP: VLAN0001 sent Topology Change Notice on Fa0/2
Oct 13 23:32:57.625: STP: VLAN0001 Fa0/2 -> forwarding

/?????? - ??? ???? ??? ???, ??? "????? ????" ??????????????? ?? root 
bridge ?? ???????? ? ????????????? TCN?

? ?????? ??????? ?????????? ?????????? - root bridge ???? ????????? ?? 
???????????, ? ??????? ?? ?????? ??????? ??????, ?.?. ??? ????:

(??????? ?????) >>> [edge switch] --- [root bridge] --- [edge switch] 
<<< (??????? ?????)

??? ????, ????? "??????????" ?????????? ?????????? ? edge-???????????, 
??????? ????? ????? TCN ? ??????? root. ??? ????

??? ??? ? ???? ?? well-known ???????? :-)

???????.

/

Vladimir Litovka

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