직접 연결되어 있지 않은 간접링크가 다운되었을때 차단상태(Blocking State)의 포트를 MAX Age(20초)를 생략하고 바로 청취 상태로 변경시켜 기본적인 STP 컨버전스 시간인 50초를 30초로 단축시킨다.

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HQ_SE_1F_SW1(config)#spanning-tree backbonefast

HQ_SE_1F_SW2(config)#spanning-tree backbonefast

HQ_SE_1F_L3_3(config)#spanning-tree backbonefast

적용 전 (20초)

07:32:04: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:06: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:08: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:10: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:12: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:14: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:16: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:18: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:20: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:32:22: STP: VLAN0010 Fa0/2 -> listening

적용 후 (20초 생략)

07:21:12: STP: VLAN0010 heard root 32778-001d.e6da.d900 on Fa0/2

07:21:12: STP: VLAN0010 Fa0/2 -> listening

07:21:12: STP: VLAN0010 Topology Change rcvd on Fa0/2

07:21:12: STP: VLAN0010 sent Topology Change Notice on Fa0/1

직접 연결된 링크가 다운 되었을 때 차단 상태에 있는 포트를 즉시 전송 상태로 변경 시키기 위해 사용.

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HQ_SE_1F_SW1(config)#spanning-tree uplinkfast

적용 전 (30초)

03:39:07: STP: VLAN0010 new root port Fa0/2, cost 38

03:39:07: STP: VLAN0010 Fa0/2 -> listening

03:39:09: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down

03:39:09: STP: VLAN0010 sent Topology Change Notice on Fa0/2

03:39:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

03:39:22: STP: VLAN0010 Fa0/2 -> learning

03:39:37: STP: VLAN0010 Fa0/2 -> forwarding

적용 후 (5초이내)

03:15:07: STP: VLAN0010 new root port Fa0/2, cost 3038

03:15:07: %SPANTREE_FAST-7-PORT_FWD_UPLINK: VLAN0010 FastEthernet0/2 moved to Forwarding (UplinkFast).

03:15:09: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down

03:15:09: STP: VLAN0010 sent Topology Change Notice on Fa0/2

03:15:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

UplinkFast is enabled

Station update rate set to 150 packets/sec.

UplinkFast statistics

-----------------------

Number of transitions via uplinkFast (all VLANs)            : 0

Number of proxy multicast addresses transmitted (all VLANs) : 0

Name                 Interface List

-------------------- ------------------------------------

VLAN0001             Fa0/2(fwd)

VLAN0010             Fa0/2(fwd)

다수의 물리적인 Link를 하나의 논리적인 Link로 만들어 대역폭 향상, Link 이중화(물리적인), Load Balancing의 이점을 얻을 수 있다.

셋팅

HQ_SE_GN_2F_SW1

interface FastEthernet0/1

 channel-protocol lacp

 channel-group 1 mode active

 switchport mode trunk

!

interface FastEthernet0/2

 channel-protocol lacp

 channel-group 1 mode active

 switchport mode trunk

HQ_SE_GN_2F_L3_1

interface FastEthernet0/1

 channel-protocol lacp

 channel-group 1 mode passive

 switchport mode trunk

!

interface FastEthernet0/2

 channel-protocol lacp

 channel-group 1 mode passive

 switchport mode trunk

HQ_SE_GN_2F_SW1

HQ_SE_GN_2F_SW1#show etherchannel summary

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+--------------

1      Po1(SU)           LACP   Fa0/1(P) Fa0/2(P)

HQ_SE_GN_2F_L3_1

HQ_SE_GN_2F_L3_1#show etherchannel summary

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+--------------

1      Po1(SU)           LACP   Fa0/1(P) Fa0/2(P)

서버실에서 외부로 나가는 Path가 Down되었을 경우나 트래픽이 많을 때를 대비해 대역폭을 확보.

셋팅

interface FastEthernet0/3

 no switchport

 no ip address

 channel-group 1 mode active

!

interface FastEthernet0/4

 no switchport

 no ip address

 channel-group 1 mode active

!

!

interface Port-channel1

 no switchport

 ip address 192.168.33.1 255.255.255.0

!

HQ_SE_2F_L3_1#show etherchannel summary

Flags:  D - down        P - in port-channel

        I - stand-alone s - suspended

        H - Hot-standby (LACP only)

        R - Layer3      S - Layer2

        U - in use      f - failed to allocate aggregator

        u - unsuitable for bundling

        w - waiting to be aggregated

        d - default port

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+-----------------------------------------------

1      Po1(RU)         LACP      Fa0/3(P)    Fa0/4(P)

HQ_SE_2F_L3_1#show interfaces port-channel 1

Port-channel1 is up, line protocol is up (connected)

  Hardware is EtherChannel, address is 001a.e27e.88c5

  Internet address is 192.168.33.1/24

  MTU 1500 bytes, BW 200000 Kbit, DLY 100 usec,

PC나 서버 등과 같이 스위칭을 하지 않는

 종단 장비들의 전송모드 전환을 빠르게 하기 위해 적용.

셋팅

HQ_SE_3F_SW3(config)#spanning-tree portfast

적용 전

06:38:42: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/11, changed state to down

06:38:46: setting bridge id (which=3) prio 32769 prio cfg 32768 sysid 1 (on) id 8001.000d.ed5e.6640

06:38:46: set portid: VLAN0001 Fa0/11: new port id 800B

06:38:46: STP: VLAN0001 Fa0/11 -> listening

06:38:47: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/11, changed state to up

06:39:01: STP: VLAN0001 Fa0/11 -> learning

06:39:16: STP: VLAN0001 Fa0/11 -> forwarding

적용 후

06:36:42: %LINK-3-UPDOWN: Interface FastEthernet0/11, changed state to up

06:36:43: setting bridge id (which=3) prio 32769 prio cfg 32768 sysid 1 (on) id  8001.000d.ed5e.6640

06:36:43: set portid: VLAN0001 Fa0/11: new port id 800B

06:36:43: STP: VLAN0001 Fa0/11 ->jump to forwarding from blocking

06:36:44: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/11, changed state to up