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根据最近的一个问题,我最近将我的 HP (2x 2900) 和 Cisco (1x 3750) 硬件配置为使用 MSTP 实现互操作性。我以为这是可行的,直到我将更改应用于第三个设备(下面的 HP 交换机 1),此时生成树根开始抖动,导致我的两个 HP 交换机之间出现性能问题(5% 的数据包丢失)。我不确定为什么。
HP Switch 1 A4 连接到 Cisco 1/0/1。HP Switch 2 B2 连接到 Cisco 2/0/1。HP Switch 1 A2 连接到 HP Switch 2 A1。我更希望 Cisco 堆栈充当根。
编辑:
HP 交换机 2 中有一行特定的行 - “spanning-tree 1 path-cost 500000”,我没有添加,而且是预先存在的。我不确定它是否会产生我所描述的那种影响。我更擅长安全和监控,而不是网络。
编辑2:
我开始相信问题在于 Cisco 上的 MST 0 实例的值仍为默认值 32768。我制作了一个图表:
这是基于我能找到的 STP 的每个 show 命令。我会在几个小时后进行此更改,看看是否有帮助。
Cisco 3750 配置:
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:
%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交换机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(这些交换机上没有配置 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(这些交换机上没有配置 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
答案1
您能将 MST 实例号更改为 0 吗?我认为这可能是导致您出现问题的原因,MST 默认运行实例 0,因此您创建了两个实例,实例 1 具有您已映射的 VLAN,实例 0 具有所有其他 VLAN。根据您的 Cisco 配置判断,您应该只需要一个实例:
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,您的根节点在抖动,但您只设置了实例 1 的优先级,而不是 0。将其全部移动到实例 0,并将 HP 交换机上的 MST 实例 0 的优先级设置为高于默认值。这样,只要它在网络上,根节点就始终是 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的配置可能是为了阻止 HP2 成为根:
语法:spanning-tree < port-list > path-cost < auto | 1..200000000 >
分配单个端口成本,交换机使用该成本来确定给定生成树中哪些端口是转发端口。在默认配置 ( auto ) 中,交换机根据端口类型确定端口的路径成本:–
10 Mbps:2000000 –
100 Mbps:200000 –
1Gbps:20000
有关运行 802.1D STP 的设备的路径成本值的兼容性信息,请参阅第 4-17 页的“有关路径成本的注意事项”(默认值:自动)。
来自HP 高级流量管理指南第 138 页。如果您没有添加路径成本语句,我会将其删除,并在您想要成为根的交换机上将桥优先级设置为更高。如果那是思科,那么您已经按照我的命令进行了设置。
答案2
哇。。经过所有的研究,我发现我唯一缺少的就是将 MST 0 实例值设置为低于默认值的值。一旦我将其设置为 4096,所有显示生成树配置都会开始按预期运行,显示 Cisco mac 作为根。
GerryEgan 的解决方案可以工作,因为它还会将 MST 0 实例更改为较低的值。但是我最终希望能够使用两个 10 千兆链路,一个用于 VLAN 1,一个用于 VLAN 100。这个一般设置是粗略地考虑到这个最终目标而制定的。我没有将它包括在问题中,因为它实际上并不相关——我迫切需要任何解决方案。
总结一下,为了配置这个设置我使用了:
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
HP 交换机
spanning-tree
spanning-tree config-name "mstp"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 40 70 100 250