portfast, uplinkfast, backbonefast

このタスクでは、STPトポロジにおける速いコンバージェンスを実現するオプションのスパニングツリー機能を設定する。
それぞれのスイッチ上のただ一つのスパニングツリー命令により、どんなアクセススイッチポートがオンラインになる時、スパニングツリーのリスニング、ラーニング状態を省略して、
直接フォワーディンぐ状態になること。
スイッチ2上のただ一つのスパニングツリー命令により、ルートポートが物理的に失われた場合、1、2秒で新なルートポートが回復されること。
それぞれのスイッチ上のただ一つのスパニングツリー命令により、指定ポートの関節リンクが失われた時に、およそ 30秒でスパニングツリートポロジのコンバージェンスが回復すること。

上記をすべて検証すること。

f:id:intrajp:20171205053028p:plain

GNS3 では、spanning-tree uplinkfast と、spanning-tree backbonefast は有効だが、spanning-tree portfast は、
それぞれのインタフェースにおいて有効にする必要があります。

SW2#conf t
*Mar 1 01:36:08.175: %SYS-5-CONFIG_I: Configured from console by console
SW2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW2(config)#int range fa1/0 - 15 , po1
SW2(config-if-range)#spann
SW2(config-if-range)#spanning-tree ?
cost Change an interface's spanning tree path cost
port-priority Change an interface's spanning tree priority
portfast Enable an interface to move directly to forwarding on link up
vlan VLAN Switch Spanning Tree

SW2(config-if-range)#spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/0 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/1 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/2 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/3 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/4 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/5 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/6 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/7 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/8 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/9 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/10 but will only
have effect when the interface
*Mar 1 01:36:47.411: %EC-5-UNBUNDLE: Interface Fa1/10 left the port-channel Po1
*Mar 1 01:36:47.483: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:47.487: %SPANTREE_FAST-7-PORT_FWD_UPLINK: VLAN1 Port-channel1 moved to Forwarding (UplinkFast).
*Mar 1 01:36:47.535: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65

*Mar 1 01:36:47.535: %EC-5-BUNDLE: Interface Fa1/10 joined port-channel Po1
*Mar 1 01:36:47.535: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:47.563: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65
is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/11 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/12 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has
*Mar 1 01:36:52.791: %EC-5-UNBUNDLE: Interface Fa1/11 left the port-channel Po1
*Mar 1 01:36:52.831: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:52.831: %SPANTREE_FAST-7-PORT_FWD_UPLINK: VLAN1 Port-channel1 moved to Forwarding (UplinkFast).
*Mar 1 01:36:52.831: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65

*Mar 1 01:36:52.831: %EC-5-BUNDLE: Interface Fa1/11 joined port-channel Po1
*Mar 1 01:36:52.831: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:52.831: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65

*Mar 1 01:36:52.883: %EC-5-UNBUNDLE: Interface Fa1/12 left the port-channel Po1
*Mar 1 01:36:52.883: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:52.883: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65

*Mar 1 01:36:52.883: %EC-5-BUNDLE: Interface Fa1/12 joined port-channel Po1
*Mar 1 01:36:52.923: STP FAST: UPLINKFAST: make_forwarding on VLAN1 Port-channel1 root port id new: 129.65 prev: 128.47

*Mar 1 01:36:52.935: STP FAST: UPLINKFAST: make_forwarding on VLAN1 FastEthernet1/6 root port id new: 128.47 prev: 129.65
been configured on FastEthernet1/13 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/14 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/15 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on Port-channel1 but will only
have effect when the interface is in a non-trunking mode.

SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#interface range fa1/0 - 15 , po1
SW1(config-if-range)#spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/10 but will only
have effect when the interface is in a non-tru
*Mar 1 01:40:00.591: %EC-5-UNBUNDLE: Interface Fa1/10 left the port-channel Po1
*Mar 1 01:40:00.687: %EC-5-BUNDLE: Interface Fa1/10 joined port-channel Po1nking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast
*Mar 1 01:40:03.927: %EC-5-UNBUNDLE: Interface Fa1/11 left the port-channel Po1
*Mar 1 01:40:04.027: %EC-5-BUNDLE: Interface Fa1/11 joined port-channel Po1
*Mar 1 01:40:04.027: %EC-5-UNBUNDLE: Interface Fa1/12 left the port-channel Po1
*Mar 1 01:40:04.027: %EC-5-BUNDLE: Interface Fa1/12 joined port-channel Po1 has been configured on FastEthernet1/13 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on Port-channel1 but will only
have effect when the interface is in a non-trunking mode.

SW3#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW3(config)#int range fa1/0 - 15
SW3(config-if-range)#spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/10 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/13 but will only
have effect when the interface is in a non-trunking mode.
%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches, bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet1/15 but will only
have effect when the interface is in a non-trunking mode.

ーーーーーーーーーーーーーーーーーーーーーー
SW3# show spanning-tree active
...(snip)...
Port 41 (FastEthernet1/0) of VLAN3 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.41.
Designated root has priority 8192, address c207.153c.0000
Designated bridge has priority 32768, address c201.1621.0000
Designated port id is 128.41, designated path cost 18
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 3196, received 0
The port is in the portfast mode <---portfast モードになっている

SW2# show spanning-tree active
...(snip)...
Port 41 (FastEthernet1/0) of VLAN3 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.41.
Designated root has priority 8192, address c207.153c.0000
Designated bridge has priority 8192, address c207.153c.0000
Designated port id is 128.41, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 3376, received 0
The port is in the portfast mode

Port 45 (FastEthernet1/4) of VLAN4 is forwarding
Port path cost 3019, Port priority 128, Port Identifier 128.45.
Designated root has priority 8192, address c206.152d.0000
Designated bridge has priority 49152, address c207.153c.0001
Designated port id is 128.45, designated path cost 37
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 3391, received 0
The port is in the portfast mode

SW1# show spanning-tree active
...(snip)...
Port 41 (FastEthernet1/0) of VLAN4 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.41.
Designated root has priority 8192, address c206.152d.0000
Designated bridge has priority 8192, address c206.152d.0000
Designated port id is 128.41, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 3539, received 0
The port is in the portfast mode

SW2#show spanning-tree summary
Root bridge for: VLAN3.
PortFast BPDU Guard is disabled
UplinkFast is enabled <------------------uplinkfast が有効になっている
BackboneFast is disabled

Name Blocking Listening Learning Forwarding STP Active
-------------------- -------- --------- -------- ---------- ----------
VLAN1 3 0 0 1 4
VLAN3 0 0 0 5 5
VLAN4 3 0 0 2 5
-------------------- -------- --------- -------- ---------- ----------
3 VLANs 6 0 0 8 14

Station update rate set to 150 packets/sec.

UplinkFast statistics
-----------------------
Number of transitions via uplinkFast (all VLANs) : 18
Number of proxy multicast addresses transmitted (all VLANs) : 0

SW2#show spanning-tree uplinkfast
UplinkFast is enabled

Station update rate set to 150 packets/sec.

UplinkFast statistics
-----------------------
Number of transitions via uplinkFast (all VLANs) : 18
Number of proxy multicast addresses transmitted (all VLANs) : 0

Name Interface List
-------------------- ------------------------------------
VLAN1 Fa1/6(fwd), Fa1/7, Fa1/8, Po1
VLAN3
VLAN4 Fa1/8(fwd), Fa1/6, Fa1/7, Po1

SW1#show spanning-tree summary
Root bridge for: VLAN4.
PortFast BPDU Guard is disabled
UplinkFast is disabled
BackboneFast is enabled <----------------------backbonefast が有効になっている

Name Blocking Listening Learning Forwarding STP Active
-------------------- -------- --------- -------- ---------- ----------
VLAN1 2 0 0 2 4
VLAN3 0 0 0 4 4
VLAN4 0 0 0 5 5
-------------------- -------- --------- -------- ---------- ----------
3 VLANs 2 0 0 11 13

BackboneFast statistics
-----------------------
Number of transition via backboneFast (all VLANs) : 0
Number of inferior BPDUs received (all VLANs) : 0
Number of RLQ request PDUs received (all VLANs) : 0
Number of RLQ response PDUs received (all VLANs) : 0
Number of RLQ request PDUs sent (all VLANs) : 0
Number of RLQ response PDUs sent (all VLANs) : 0

SW1#show spanning-tree backbonefast
BackboneFast is enabled

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portfast, uplinkfast, backbonefast