IEEE 802.1w RSTP

　　IEEE 802.1w RSTP

 

기존 STP의 약점인 네트워크 토폴로지 변경시 Spanning -tree 의 재계산 등의 시간을 대폭 향상

IEEE 802.1d STP 컨버전스에 비해 포트 이전이 상당히 빠른 STP

 

RSTP 는 BPDU 와 TCN BPDU 대신 Proposal BPDU 와 Agreenment BPDU 를 사용

 

 

 

 

 

 

SW1#spanning-tree mode rapid-pvst

SW1#do sh span vlan 1

 

VLAN0001

  Spanning tree enabled protocol rstp ★

  Root ID    Priority    4097

             Address     0014.1caf.a100

             Cost        19

             Port        24 (FastEthernet0/24)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)

             Address     000e.3889.d700

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/20              Altn BLK 19        128.20   P2p Peer(STP)

Fa0/24              Root FWD 19        128.24   P2p Peer(STP)

 

 

 

　　PVST(Per VLAN Spanning-Teree) : 각각의 VLAN마다 spannig-tree 를 제공 / 최대 VLAN 128개까지 제공

 

why? Root Bridge 를 서로 다르게해서 Back Bridge 와 Blocking 을 다르게 설정 하려고

 →각 VLAN 마다 우선순위를 다르게 설정

 

 

[실습Ⅰ VLAN 11-14 Root,Backup Bridge 수동설정]

@SW1

 

conf t

spanning-tree vlan 11 priority 4096 ←Root Bridge

spanning-tree vlan 13 priority 4096 ←Root Bridge

spanning-tree vlan 12 priority 16384 ←Backup Bridge

spanning-tree vlan 14 priority 16384 ←Backup Bridge

 

 

@SW3

 

conf t

spanning-tree vlan 11 priority 16384

spanning-tree vlan 13 priority 16384

spanning-tree vlan 12 priority 4096

spanning-tree vlan 14 priority 4096

 

@SW2

 

SW2#sh spanning-tree

 

VLAN0001

  Spanning tree enabled protocol rstp

  Root ID    Priority    4097

             Address     0014.1caf.a100

             This bridge is the root

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    4097   (priority 4096 sys-id-ext 1)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Desg FWD 19        128.22   P2p Peer(STP)

Fa0/24              Desg FWD 19        128.24   P2p

 

         

VLAN0011

  Spanning tree enabled protocol rstp

  Root ID    Priority    32779

             Address     000d.bd19.4f80

             Cost        19

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32779  (priority 32768 sys-id-ext 11)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 19        128.22   P2p Peer(STP)

Fa0/24              Altn BLK 19        128.24   P2p

 

         

VLAN0012

  Spanning tree enabled protocol rstp

  Root ID    Priority    32780

             Address     000d.bd19.4f80

             Cost        19

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32780  (priority 32768 sys-id-ext 12)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 19        128.22   P2p Peer(STP)

Fa0/24              Altn BLK 19        128.24   P2p

 

         

VLAN0013

  Spanning tree enabled protocol rstp

  Root ID    Priority    32781

             Address     000d.bd19.4f80

             Cost        19

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32781  (priority 32768 sys-id-ext 13)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 19        128.22   P2p Peer(STP)

Fa0/24              Altn BLK 19        128.24   P2p

 

         

VLAN0014

  Spanning tree enabled protocol rstp

  Root ID    Priority    32782

             Address     000d.bd19.4f80

             Cost        19

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32782  (priority 32768 sys-id-ext 14)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 19        128.22   P2p Peer(STP)

Fa0/24              Altn BLK 19        128.24   P2p

 

 

 

<예제>

 

-SW1은 VLAN 100에 대해서 Root Bridge, SW2는 Backup Bridge

-SW2은 VLAN 200에 대해서 Root Bridge, SW3는 Backup Bridge

-SW3은 VLAN 300에 대해서 Root Bridge, SW1는 Backup Bridge

 

SW1에서 VLAN 100에 우선순위 4096 VALN 300에 우선순위 16384 설정

SW2에서 VLAN 200에 우선순위 4096 VALN 100에 우선순위 16384 설정

SW3에서 VLAN 300에 우선순위 4096 VALN 200에 우선순위 16384 설정

 

@SW1

 

SW1(config)#spanning-tree vlan 100 priority 4096

SW1(config)#spanning-tree vlan 300 priority 16384

 

SW1#sh spanning-tree

 

VLAN0100

  Spanning tree enabled protocol rstp

  Root ID    Priority    4196

             Address     000e.3889.d700

             This bridge is the root

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    4196   (priority 4096 sys-id-ext 100)

             Address     000e.3889.d700

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/20              Desg FWD 19        128.20   P2p Peer(STP)

Fa0/24              Desg FWD 19        128.24   P2p

 

         

VLAN0200

  Spanning tree enabled protocol rstp

  Root ID    Priority    16584

             Address     000d.bd19.4f80

             Cost        19

             Port        20 (FastEthernet0/20)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32968  (priority 32768 sys-id-ext 200)

             Address     000e.3889.d700

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/20              Root FWD 19        128.20   P2p Peer(STP)

Fa0/24              Desg FWD 19        128.24   P2p

 

         

VLAN0300

  Spanning tree enabled protocol rstp

  Root ID    Priority    4396

             Address     000d.bd19.4f80

             Cost        19

             Port        20 (FastEthernet0/20)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    16684  (priority 16384 sys-id-ext 300)

             Address     000e.3889.d700

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/20              Root FWD 19        128.20   P2p Peer(STP)

Fa0/24              Desg FWD 19        128.24   P2p

 

 

 

 

 

　　IEEE 802.1s MSTP(Multiple Spanning-Tree Protocol)

 

 - VLAN이 128개 초과시 사용

 - 자동으로 RSTP가 사용되며 mode를 바꿔야함

 

 

vlan 1~100        ←MST 1           ←STP

vlan 101~200     ←MST 2           ←STP

 

 

 

@SW1, SW2, SW3

 

conf t

 

spanning-tree mode mst

 

SW2#sh spanning-tree   

 

MST0 ← VLAN 0001에서 변경됨

  Spanning tree enabled protocol mstp

  Root ID    Priority    32768

             Address     000d.bd19.4f80

             Cost        0

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32768  (priority 32768 sys-id-ext 0)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 200000    128.22   P2p

Fa0/24              Desg FWD 200000    128.24   P2p Bound(PVST)

 

 

SW2#sh spanning-tree mst

 

##### MST0    vlans mapped:   1-4094 ←VLAN이 128개 초과 

Bridge        address 0014.1caf.a100  priority      32768 (32768 sysid 0)

Root          address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

              port    Fa0/22          path cost     0        

Regional Root address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

                                      internal cost 200000    rem hops 19

Operational   hello time 2 , forward delay 15, max age 20, txholdcount 6

Configured    hello time 2 , forward delay 15, max age 20, max hops    20

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p Bound(PVST)

 

 

 → MST 는 따로 분산처리가 되지 않아 그룹을 만들어야함

 

 

@SW1, SW2, SW3

conf t

vlan 11

vlan 12

vlan 13

vlan 14

 

@SW2

 

conf t

spanning-tree mode mst

spanning-tree mst configuration

revision 1

name CISCO

instance 1 vlan 11,13 ←수정할때 1씩 증가하고 VLAN 11,13을 한그룹으로 묶음

instance 2 vlan 12,14

!

end

 

SW2#sh spanning-tree

 

MST0

  Spanning tree enabled protocol mstp

  Root ID    Priority    32768

             Address     000d.bd19.4f80

             Cost        0

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32768  (priority 32768 sys-id-ext 0)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 200000    128.22   P2p

Fa0/24              Desg BLK 200000    128.24   P2p Bound(PVST)

 

         

MST1

  Spanning tree enabled protocol mstp

  Root ID    Priority    32769

             Address     000d.bd19.4f80

             Cost        200000

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 200000    128.22   P2p

Fa0/24              Desg BLK 200000    128.24   P2p Bound(PVST)

 

         

MST2

  Spanning tree enabled protocol mstp

  Root ID    Priority    32770

             Address     000d.bd19.4f80

             Cost        200000

             Port        22 (FastEthernet0/22)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

  Bridge ID  Priority    32770  (priority 32768 sys-id-ext 2)

             Address     0014.1caf.a100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 

Interface           Role Sts Cost      Prio.Nbr Type

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

Fa0/22              Root FWD 200000    128.22   P2p

Fa0/24              Desg BLK 200000    128.24   P2p Bound(PVST)

 

 

 

SW2#sh spanning-tree mst

 

##### MST0    vlans mapped:   1-10,15-4094

Bridge        address 0014.1caf.a100  priority      32768 (32768 sysid 0)

Root          address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

              port    Fa0/22          path cost     0       

Regional Root address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

                                      internal cost 200000    rem hops 19

Operational   hello time 2 , forward delay 15, max age 20, txholdcount 6

Configured    hello time 2 , forward delay 15, max age 20, max hops    20

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg LRN 200000    128.24   P2p Bound(PVST)

 

##### MST1    vlans mapped:   11,13

Bridge        address 0014.1caf.a100  priority      32769 (32768 sysid 1)

Root          address 000d.bd19.4f80  priority      32769 (32768 sysid 1)

              port    Fa0/22          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p Bound(PVST)

 

##### MST2    vlans mapped:   12,14

Bridge        address 0014.1caf.a100  priority      32770 (32768 sysid 2)

Root          address 000d.bd19.4f80  priority      32770 (32768 sysid 2)

              port    Fa0/22          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p Bound(PVST)

 

 

 

[실습Ⅱ 조건으로 MST 설정해 Root&Backup Bridge 설정]

 

@SW1

 

SW1(config)#spanning-tree mst 1 priority 4096

SW1(config)#spanning-tree mst 2 priority 16384

 

@SW3

 

SW3(config)#spanning-tree mst 2 priority 4096

SW3(config)#spanning-tree mst 1 priority 16384

 

@SW2

 

SW2#sh spanning-tree mst 1

 

##### MST1    vlans mapped:   11,13

Bridge        address 0014.1caf.a100  priority      32769 (32768 sysid 1)

Root          address 000e.3889.d700  priority      4097  (4096 sysid 1)

              port    Fa0/24          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Altn BLK 200000    128.22   P2p

Fa0/24           Root FWD 200000    128.24   P2p

 

SW2#sh spanning-tree mst 2

 

##### MST2    vlans mapped:   12,14

Bridge        address 0014.1caf.a100  priority      32770 (32768 sysid 2)

Root          address 000d.bd19.4f80  priority      4098  (4096 sysid 2)

              port    Fa0/22          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Altn BLK 200000    128.24   P2p

 

 

 

<예제>

 

-SW1은 VLAN100,200에 대해서 Root Bridge, SW2는 Backup Bridge

-SW2은 VLAN300,400에 대해서 Root Bridge, SW3는 Backup Bridge

-SW3은 VLAN500,600에 대해서 Root Bridge, SW1는 Backup Bridge

 

SW1에서 VLAN 100,200 / VLAN 500,600을 MST mode 로 그룹화하고 우선순위 4096 / 16384 설정

SW2에서 VLAN 200,300 / VLAN 100,200을 MST mode 로 그룹화하고 우선순위 4096 / 16384 설정

SW3에서 VLAN 500,600 / VLAN 300,400을 MST mode 로 그룹화하고 우선순위 4096 / 16384 설정

 

conf t

vlan 100,200,300,400,500,600

 

@SW1

SW1(config)#spanning-tree mode mst

!

SW1(config)#spanning-tree mst configuration

SW1(config-mst)#revision 1

SW1(config-mst)#name CISCO

SW1(config-mst)#instance 1 vlan 100,200

SW1(config-mst)#instance 2 vlan 500,600

SW1(config-mst)#instance 3 vlan 300,400

 

SW1#sh spanning-tree mst

 

##### MST0    vlans mapped:   1-10,15-99,101-199,201-299,301-399,401-499

                               501-599,601-4094

Bridge        address 000e.3889.d700  priority      32768 (32768 sysid 0)

Root          address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

              port    Fa0/20          path cost     200000  

Regional Root this switch

Operational   hello time 2 , forward delay 15, max age 20, txholdcount 6

Configured    hello time 2 , forward delay 15, max age 20, max hops    20

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/20           Root FWD 200000    128.20   P2p Bound(RSTP)

Fa0/24           Altn BLK 200000    128.24   P2p Bound(RSTP)

 

##### MST1    vlans mapped:   11,13,100,200

Bridge        address 000e.3889.d700  priority      4097  (4096 sysid 1)

Root          this switch for MST1

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/20           Mstr FWD 200000    128.20   P2p Bound(RSTP)

Fa0/24           Altn BLK 200000    128.24   P2p Bound(RSTP)

         

##### MST2    vlans mapped:   12,14,500,600

Bridge        address 000e.3889.d700  priority      16386 (16384 sysid 2)

Root          this switch for MST2

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/20           Mstr FWD 200000    128.20   P2p Bound(RSTP)

Fa0/24           Altn BLK 200000    128.24   P2p Bound(RSTP)

 

##### MST3    vlans mapped:   300,400

Bridge        address 000e.3889.d700  priority      32771 (32768 sysid 3)

Root          this switch for MST3

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/20           Mstr FWD 200000    128.20   P2p Bound(RSTP)

Fa0/24           Altn BLK 200000    128.24   P2p Bound(RSTP)

 

 

@SW2

 

SW2#sh spanning-tree mst

 

##### MST0    vlans mapped:   1-10,15-99,101-199,201-299,301-399,401-499

                               501-599,601-4094

Bridge        address 0014.1caf.a100  priority      32768 (32768 sysid 0)

Root          address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

              port    Fa0/22          path cost     0       

Regional Root address 000d.bd19.4f80  priority      32768 (32768 sysid 0)

                                      internal cost 200000    rem hops 19

Operational   hello time 2 , forward delay 15, max age 20, txholdcount 6

Configured    hello time 2 , forward delay 15, max age 20, max hops    20

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p

 

##### MST1    vlans mapped:   11,13,100,200

Bridge        address 0014.1caf.a100  priority      32769 (32768 sysid 1)

Root          address 000d.bd19.4f80  priority      16385 (16384 sysid 1)

              port    Fa0/22          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p

 

##### MST2    vlans mapped:   12,14,300,400

Bridge        address 0014.1caf.a100  priority      4098  (4096 sysid 2)

Root          this switch for MST2

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Desg FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p

 

##### MST3    vlans mapped:   500,600

Bridge        address 0014.1caf.a100  priority      16387 (16384 sysid 3)

Root          address 000d.bd19.4f80  priority      4099  (4096 sysid 3)

              port    Fa0/22          cost          200000    rem hops 19

 

Interface        Role Sts Cost      Prio.Nbr Type

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

Fa0/22           Root FWD 200000    128.22   P2p

Fa0/24           Desg FWD 200000    128.24   P2p