HP至Cisco生成树根震荡

9

根据最近的问题，我最近将HP（2x 2900）和Cisco（1x 3750）硬件都配置为使用MSTP进行互操作。我一直认为这是可行的，直到我将更改应用到第三台设备（下面的HP交换机1），那时生成树的根开始开始震荡，从而导致两个HP交换机之间出现性能问题（丢包率5％）。我不知道为什么。

HP Switch 1 A4已连接到Cisco 1/0/1。HP Switch 2 B2已连接到Cisco 2/0/1。HP Switch 1 A2连接到HP Switch 2 A1。我希望Cisco堆栈充当根。

编辑：

我没有添加并且已经存在的HP交换机2中有一条特定的行-'s​​panning-tree 1 path-cost 500000'。我不确定它是否会产生我所描述的那种影响。我比网络更像是一个安全和监控人员。

编辑2：

我开始认为问题出在Cisco MST 0实例的值仍为默认值32768的事实。我制作了一个图表：生成树MAC关联 该图表基于我可以为STP找到的每个show命令。我会在几个小时后进行更改，看看是否有帮助。

思科3750 Config： 

version 12.2

spanning-tree mode mst
spanning-tree extend system-id
spanning-tree mst configuration
 name mstp
 revision 1
 instance 1 vlan 1, 40, 70, 100, 250
spanning-tree mst 1 priority 0
vlan internal allocation policy ascending

interface TenGigabitEthernet1/1/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface TenGigabitEthernet2/1/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Vlan1
 no ip address
!
interface Vlan100
 ip address 192.168.100.253 255.255.255.0
!

Cisco 3750显示生成树：

show spanning-tree

MST0
  Spanning tree enabled protocol mstp
  Root ID    Priority    32768
             Address     0004.ea84.5f80
             Cost        200000
             Port        53 (TenGigabitEthernet1/1/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32768  (priority 32768 sys-id-ext 0)
             Address     a44c.11a6.7c80
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/1             Root FWD 2000      128.53   P2p


MST1
  Spanning tree enabled protocol mstp
  Root ID    Priority    1
             Address     a44c.11a6.7c80
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    1      (priority 0 sys-id-ext 1)
             Address     a44c.11a6.7c80
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/1             Desg FWD 2000      128.53   P2p

Cisco 3750显示日志记录：

%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up

HP开关1：

; J9049A Configuration Editor; Created on release #T.13.71
vlan 1
   name "DEFAULT_VLAN"
   untagged 1-8,10,13-16,18-23,A1-A4
   ip address 100.100.100.17 255.255.255.0
   no untagged 9,11-12,17,24
   exit
vlan 100
   name "192.168.100"
   untagged 9,11-12,17,24
   tagged 1-8,10,13-16,18-23,A1-A4
   no ip address
   exit
vlan 21
   name "Users_2"
   tagged 1,A1-A4
   no ip address
   exit
vlan 40
   name "Cafe"
   tagged 1,4,7,A1-A4
   no ip address
   exit
vlan 250
   name "Firewall"
   tagged 1,4,7,A1-A4
   no ip address
   exit
vlan 70
   name "DMZ"
   tagged 1,4,7-8,13,A1-A4
   no ip address
   exit
spanning-tree
spanning-tree config-name "mstp"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 40 70 100 250
password manager
password operator

HP Switch 1显示生成树：

 show spanning-tree

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 2-39,41-69,71-99,101-249,251-4094
  Switch MAC Address : 0021f7-126580
  Switch Priority    : 32768
  Max Age  : 20
  Max Hops : 20
  Forward Delay : 15

  Topology Change Count  : 363,490
  Time Since Last Change : 14 hours

  CST Root MAC Address : 0004ea-845f80
  CST Root Priority    : 32768
  CST Root Path Cost   : 200000
  CST Root Port        : 1

  IST Regional Root MAC Address : 0021f7-126580
  IST Regional Root Priority    : 32768
  IST Regional Root Path Cost   : 0
  IST Remaining Hops            : 20

  Root Guard Ports     :
  TCN Guard Ports      :
  BPDU Protected Ports :
  BPDU Filtered Ports  :
  PVST Protected Ports :
  PVST Filtered Ports  :

                  |           Prio            | Designated    Hello
  Port  Type      | Cost      rity State      | Bridge        Time PtP Edge
  ----- --------- + --------- ---- ---------- + ------------- ---- --- ----
  A1              | Auto      128  Disabled   |
  A2    10GbE-CX4 | 2000      128  Forwarding | 0021f7-126580 2    Yes No
  A3    10GbE-CX4 | Auto      128  Disabled   |
  A4    10GbE-SR  | Auto      128  Disabled   |

HP Switch 1日志记录：我删除了日期/时间字段，因为它们不准确（这些交换机上未配置NTP）

00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to 32768:0021f7-126580
00839 stp: MSTI 1 Root changed from 32768:0021f7-126580 to 0:a44c11-a67c80
00842 stp: MSTI 1 starved for an MSTI Msg Rx on port A4 from 0:a44c11-a67c80
00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to 32768:0021f7-126580
00839 stp: MSTI 1 Root changed from 32768:0021f7-126580 to 0:a44c11-a67c80
00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to ...

HP Switch 2配置：

; J9146A Configuration Editor; Created on release #W.14.49

vlan 1
   name "DEFAULT_VLAN"
   untagged 1,3-17,21-24,A1-A2,B2
   ip address 100.100.100.36 255.255.255.0
   no untagged 2,18-20,B1
   exit
vlan 100
   name "192.168.100"
   untagged 2,18-20
   tagged 1,3-17,21-24,A1-A2,B1-B2
   no ip address
   exit
vlan 21
   name "Users_2"
   tagged 1,A1-A2,B2
   no ip address
   exit
vlan 40
   name "Cafe"
   tagged 1,13-14,16,A1-A2,B2
   no ip address
   exit
vlan 250
   name "Firewall"
   tagged 1,13-14,16,A1-A2,B2
   no ip address
   exit
vlan 70
   name "DMZ"
   tagged 1,13-14,16,A1-A2,B2
   no ip address
   exit
logging 192.168.100.18
spanning-tree
spanning-tree 1 path-cost 500000
spanning-tree config-name "mstp"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 40 70 100 250

HP Switch 2生成树：

show spanning-tree

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 2-39,41-69,71-99,101-249,251-4094
  Switch MAC Address : 0024a8-cd6000
  Switch Priority    : 32768
  Max Age  : 20
  Max Hops : 20
  Forward Delay : 15

  Topology Change Count  : 21,793
  Time Since Last Change : 14 hours

  CST Root MAC Address : 0004ea-845f80
  CST Root Priority    : 32768
  CST Root Path Cost   : 200000
  CST Root Port        : A1

  IST Regional Root MAC Address : 0021f7-126580
  IST Regional Root Priority    : 32768
  IST Regional Root Path Cost   : 2000
  IST Remaining Hops            : 19

  Root Guard Ports     :
  TCN Guard Ports      :
  BPDU Protected Ports :
  BPDU Filtered Ports  :
  PVST Protected Ports :
  PVST Filtered Ports  :

                  |           Prio            | Designated    Hello
  Port  Type      | Cost      rity State      | Bridge        Time PtP Edge
  ----- --------- + --------- ---- ---------- + ------------- ---- --- ----
  A1    10GbE-CX4 | 2000      128  Forwarding | 0021f7-126580 2    Yes No
  A2    10GbE-CX4 | Auto      128  Disabled   |
  B1    SFP+SR    | 2000      128  Forwarding | 0024a8-cd6000 2    Yes No
  B2              | Auto      128  Disabled   |

HP Switch 2日志记录：我删除了日期/时间字段，因为它们不准确（这些交换机上未配置NTP）

00839 stp: CST Root changed from 32768:0021f7-126580 to 32768:0004ea-845f80
00839 stp: IST Root changed from 32768:0021f7-126580 to 32768:0024a8-cd6000
00839 stp: CST Root changed from 32768:0004ea-845f80 to 32768:0024a8-cd6000
00839 stp: CST Root changed from 32768:0024a8-cd6000 to 32768:0004ea-845f80
00839 stp: CST Root changed from 32768:0004ea-845f80 to 32768:0024a8-cd6000
00435 ports: port B1 is Blocked by STP
00839 stp: CST Root changed from 32768:0024a8-cd6000 to 32768:0021f7-126580
00839 stp: IST Root changed from 32768:0024a8-cd6000 to 32768:0021f7-126580
00839 stp: CST Root changed from 32768:0021f7-126580 to 32768:0004ea-845f80
cisco  hp-procurve  cisco-catalyst  stp  spanning-tree 
— 蒂姆·布里格姆（Tim Brigham）
source

Answers:

4

您可以将MST实例号更改为0吗？我认为这可能是造成您的问题的原因，MST默认情况下运行实例0，因此您创建了两个实例，实例1与您映射的VLAN关联，实例0与所有其他实例关联。从您的Cisco配置来看，您只需要一个实例：

spanning-tree mst configuration
 name mstp
 revision 1
 instance 0 vlan 1, 40, 70, 100, 250
 spanning-tree mst 0 root primary

奇怪的是，您的根正在震荡，但您仅将实例1的优先级设置为0。将其全部移至实例0，并将HP交换机上MST实例0的优先级设置为高于默认值。然后，只要在网络上，根将始终是3750。

在HP交换机上：

spanning-tree
spanning-tree config-name "mstp"
spanning-tree config-revision 1
spanning-tree instance 0 vlan 1 40 70 100 250
spanning-tree priority 36864

生成树路径成本命令可能已配置为阻止HP2成为根目录：

语法：spanning-tree <端口列表> path-cost <auto | 1..200000000>

分配单个端口成本，交换机使用该成本来确定哪些端口正在转发给定生成树中的端口。在默认配置（auto）中，交换机根据端口的类型确定端口的路径开销：–

10 Mbps：2000000 –

100 Mbps：200000 –

1 Gbps：20000

有关路径成本值与运行802.1D STP的设备的兼容性的信息，请参阅第4-17页的“路径成本注释”（默认：自动）。

请参阅《HP高级流量管理指南》第138页。如果您未添加路径成本声明，我将其删除，而只是在要成为根节点的交换机上设置更高的网桥优先级。如果那是Cisco，那么您已经设置好我的命令。

— 格里·伊根
source
3

哇..经过所有研究，结果我所缺少的只是将MST 0实例值设置为比默认值低的值。将其设置为4096后，所有显示生成树配置均开始按预期运行，并以Cisco macs为根。

GerryEgan的解决方案可以使用，因为它也可以将MST 0实例更改为较低的值。但是，我最终希望能够同时使用10个千兆链路，一个用于VLAN 1，一个用于VLAN100。考虑到最终目标，粗略地设置了此常规设置。我没有将它包含在问题中，因为它实际上并没有涉及-我非常渴望任何解决方案。

总之，我使用以下配置来配置此设置：

思科3750

spanning-tree mode mst
spanning-tree extend system-id
spanning-tree mst configuration
 name mstp
 revision 1
 instance 1 vlan 1, 40, 70, 100, 250
spanning-tree mst 1 priority 0
spanning-tree mst 0 priority 4096

惠普开关

spanning-tree
spanning-tree config-name "mstp"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 40 70 100 250
— 蒂姆·布里格姆（Tim Brigham）
source
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