06-17-2009 07:59 PM - edited 03-06-2019 06:19 AM
Hi All,
i got in trouble with SPT with Cisco 6509 .
The four switchs are link with 802.1q trunk, the port cost is show on diagram .
I setup vlan 3808 on four switchs and router ,ip address as below.
s3:1.1.1.73
s4:1.1.1.74
s5:1.1.1.75
s6:1.1.1.76
router:209.205.86.77
when the fiber down between s5 and s6 .
router can ping s6, but s5 can't ping s6 .s5 know s6 mac address ,and the s6 know s5 mac address .
s5 can ping s3,s4.
s3,s4 and ping all devices
I don't know why the s5 can't ping s6 .
s3 config file:
interface TenGigabitEthernet5/1
description S3-To-S5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
spanning-tree portfast disable
end
!
interface TenGigabitEthernet5/2
description S3-To-S4
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
spanning-tree portfast disable
end
s4 config file :
interface TenGigabitEthernet5/1
description S4-To-S3
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
end
interface GigabitEthernet2/12
description s4-to-S6
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no ip address
speed nonegotiate
spanning-tree cost 50
end
s5 config file :
interface TenGigabitEthernet5/1
description S5-To-S3
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
end
interface TenGigabitEthernet5/2
description S5-To-S6
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-3807,3809-4094
switchport mode trunk
no ip address
end
s6 config file :
interface TenGigabitEthernet5/1
description S6--to-S5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
end
interface GigabitEthernet2/1
description s6-to-S4
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no ip address
speed nonegotiate
spanning-tree cost 50
end
06-18-2009 12:49 AM
Hello,
be aware that vlan 3808 is not permitted on this port
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In response to:
STP problem with 6509
liuguiqing
Jun 17, 2009, 8:59pm PST
Hi All,
i got in trouble with SPT with Cisco 6509 .
The four switchs are link with 802.1q trunk, the port cost is show on diagram .
I setup vlan 3808 on four switchs and router ,ip address as below.
s3:1.1.1.73
s4:1.1.1.74
s5:1.1.1.75
s6:1.1.1.76
router:209.205.86.77
when the fiber down between s5 and s6 .
router can ping s6, but s5 can't ping s6 .s5 know s6 mac address ,and the s6 know s5 mac address .
s5 can ping s3,s4.
s3,s4 and ping all devices
I don't know why the s5 can't ping s6 .
s3 config file:
interface TenGigabitEthernet5/1
description S3-To-S5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
spanning-tree portfast disable
end
!
interface TenGigabitEthernet5/2
description S3-To-S4
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
spanning-tree portfast disable
end
s4 config file :
interface TenGigabitEthernet5/1
description S4-To-S3
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
end
interface GigabitEthernet2/12
description s4-to-S6
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no ip address
speed nonegotiate
spanning-tree cost 50
end
s5 config file :
interface TenGigabitEthernet5/1
description S5-To-S3
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
end
interface TenGigabitEthernet5/2
description S5-To-S6
switchport
but it is permitted on the other side
interface TenGigabitEthernet5/1
description S6--to-S5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
this has to be fixed both ends have to agree on the permitted vlan list
Hope to help
Giuseppe
06-18-2009 06:55 PM
Hi,
Thaks for your reply .
i want to redundance the link ,it's a ring .when the link down between s5 and s6. the traffice will go s5-s3-s4-s6.
PS: the link between s6 and s4 was QinQ tunnel provide by ISP .
I setup a test LAB as the diagram with four switch ,direct connect with cable ,don't use QinQ tunnel ,it works fine , four switch can ping each other .
The problem is QinQ tunnel ?
06-18-2009 08:44 PM
Hello Liuquinq,
sorry for the terrible mess I did in my first answer I thought I had pasted only part of your original post
I was meaning you have a mismatch on the list of permitted vlans on the two sides of link between s5,s6 and this is not good.
to emulate 802.1Q tunneling service you need to use two switches or at least two 802.1Q tunnel interfaces.
customer side site A -- tunnel -- SP net -- tunnel --- customer side site B
Hope to help
Giuseppe
06-18-2009 09:51 PM
Hi Giuseppe,
spanning-tree mode is pvst .
When I using the follow LAB, all things works well .
s5--ethernet------s3
| |
| |
ethernet ethernet
| |
| |
s6----ethernet---s4
when i use follow LAB, s5 and s6 learn MAC address from each other,but s5 and s6 can't ping s6 ,when i setup a router
behind s5 , the router can ping s6 and the s6 can ping the router .
s5-----------ethernet----------s3
| |
| |
ethernet ethernet
| |
| |
s6---ISP----Svlan QinQ--ISP----s4
06-18-2009 10:50 PM
Hi, liuguiqing,
I think, there could be the problem that you deleted VLAN 3808 only at one side. If you want to delete definite VLAN from trunk you should do that on both side. Do show output for ARP of S5 and S6 IP-addresses and look they learned those MAC-addresses which interfaces from. I won't be surprised if S6 sees S5 via its direct link, not via S4.
By the way, could you post some outputs for S5 and S6:
show spanning-tree vlan 3808
Best regards, Igor.
06-22-2009 12:10 AM
Hi Ilaqovsky,
I deleted VLAN 3808 at two side ,force it through the QinQ .
I can sure no short-circuit or loop at all on vlan 3808 .
S5#sh spanning-tree vlan 3808
VLAN3808
Spanning tree enabled protocol ieee
Root ID Priority 36576
Address 0009.12ed.1700
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 36576 (priority 32768 sys-id-ext 3808)
Address 0009.12ed.1700
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi2/10 Desg FWD 4 128.138 P2p
Te5/1 Desg FWD 2 128.513 P2p
S3#sh spanning-tree vlan 3808
VLAN3808
Spanning tree enabled protocol ieee
Root ID Priority 36576
Address 0009.12ed.1700
Cost 2
Port 513 (TenGigabitEthernet5/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 36576 (priority 32768 sys-id-ext 3808)
Address 000b.bf8c.cf80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Te5/1 Root FWD 2 128.513 P2p
Te5/2 Desg FWD 2 128.514 P2p
S4#sh spanning-tree vlan 3808
VLAN3808
Spanning tree enabled protocol ieee
Root ID Priority 36576
Address 0009.12ed.1700
Cost 4
Port 513 (TenGigabitEthernet5/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 36576 (priority 32768 sys-id-ext 3808)
Address 000b.bf8c.7380
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi2/12 Desg FWD 50 128.140 P2p
Te5/1 Root FWD 2 128.513 P2p
S6#sh spanning-tree vlan 3808
VLAN3808
Spanning tree enabled protocol ieee
Root ID Priority 36576
Address 0009.12ed.1700
Cost 54
Port 129 (GigabitEthernet2/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 36576 (priority 32768 sys-id-ext 3808)
Address 00d0.061f.2000
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi2/1 Root FWD 50 128.129 P2p
06-22-2009 12:58 AM
Hi, liuguiqing,
I didn't see any misunderstandings in your posted outputs. Just, you probably cut off a part of the output for the S6; I don't see the port which is connected to the S5 in the blocked state.
My suggestion is to use some sniffer to resolve this problem.
06-22-2009 12:11 AM
S5#sh arp | inc 3808
Internet x.x.x.74 7 000b.bf8c.7380 ARPA Vlan3808
Internet x.x.x.75 - 0009.12ed.1700 ARPA Vlan3808
Internet x.x.x.73 6 000b.bf8c.cf80 ARPA Vlan3808
Internet x.x.x.76 14 00d0.061f.2000 ARPA Vlan3808
S5#
S6#sh arp | inc 3808
Internet x.x.x.74 8 000b.bf8c.7380 ARPA Vlan3808
Internet x.x.x.75 8 0009.12ed.1700 ARPA Vlan3808
Internet x.x.x.73 7 000b.bf8c.cf80 ARPA Vlan3808
Internet x.x.x.76 - 00d0.061f.2000 ARPA Vlan3808
S5#ping x.x.x.73
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.73, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/20/84 ms
S5#ping x.x.x.74
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.74, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
S5#ping x.x.x.75
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.75, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
S5#ping x.x.x.76
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.76, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
06-22-2009 12:16 AM
the s5 and s6 can learn mac address correct.
S5#sh mac-address-table vlan 3808
Legend: * - primary entry
age - seconds since last seen
n/a - not available
vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
* 3808 3333.0000.000d static Yes - Gi2/6,Gi2/7,Gi2/8,Gi2/9
Gi2/10,Gi2/11,Gi2/12,Gi2/13
Gi2/14,Te5/1,Te5/2,Gi5/3
Router,Switch
* 3808 000b.bf8c.cf80 dynamic Yes 5 Te5/1
* 3808 3333.0000.0001 static Yes - Switch,Stby-Switch
* 3808 0009.12ed.1700 static No - Router
* 3808 3333.0000.0016 static Yes - Switch,Stby-Switch
* 3808 00d0.061f.2000 dynamic Yes 280 Te5/1
* 3808 000b.bf8c.7380 dynamic Yes 10 Te5/1
S6#sh mac-address-table vlan 3808
Legend: * - primary entry
age - seconds since last seen
n/a - not available
vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
* 3808 3333.0000.000d static Yes - Gi2/1,Gi2/2,Gi2/11,Gi2/12
Gi2/13,Gi2/14,Gi2/15,Te5/1
Router,Switch
* 3808 000b.bf8c.cf80 dynamic Yes 15 Gi2/1
* 3808 3333.0000.0001 static Yes - Switch,Stby-Switch
* 3808 0009.12ed.1700 dynamic Yes 90 Gi2/1
* 3808 3333.0000.0016 static Yes - Switch,Stby-Switch
* 3808 00d0.061f.2000 static No - Router
* 3808 000b.bf8c.7380 dynamic Yes 15 Gi2/1
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