华为交换机S5700对接H3C S5800对接trunk居然不通，以下是排查思路。

一、两端交换机所做配置核查
1、华为交换机S5700配置：

[hw-s5700] interface GigabitEthernet0/0/1
[hw-s5700-GigabitEthernet0/0/1]port link-type trunk
[hw-s5700-GigabitEthernet0/0/1]port trunk allow-pass vlan all

2、华三交换机S5800配置：

[h3c-s5800] interface GigabitEthernet0/0/1
[h3c-s5800-GigabitEthernet0/0/1]port link-type trunk
[h3c-s5800-GigabitEthernet0/0/1]port trunk permit vlan all

结论：两端交换机接口所做配置一致。

二、查看接口状态
1、华为交换机S5700接口状态：

[hw-s5700]dis int brief 
PHY: Physical
*down: administratively down
(l): loopback
(s): spoofing
(b): BFD down
(e): ETHOAM down
(dl): DLDP down
(d): Dampening Suppressed
InUti/OutUti: input utility/output utility
Interface                   PHY   Protocol InUti OutUti   inErrors  outErrors
GigabitEthernet0/0/1        up    up          0%     0%          0          0
GigabitEthernet0/0/2        down  down        0%     0%          0          0

2、华三交换机S5800接口状态：

[h3c-s5800]dis int brief 
PHY: Physical
*down: administratively down
(l): loopback
(s): spoofing
(b): BFD down
(e): ETHOAM down
(dl): DLDP down
(d): Dampening SuppressedInUti/OutUti: input utility/output utility
Interface                   PHY   Protocol InUti OutUti   inErrors  outErrors
GigabitEthernet0/0/1        up    up          0%     0%          0          0
GigabitEthernet0/0/2        down  down        0%     0%          0          0

结论：两端交换机接口状态均为UP，也尝试更换工程网线，排除物理层问题导致。

三、确认接口PVID信息
1、华为交换机S5700接口PVID：

[hw-s5700]dis interface GigabitEthernet 0/0/1
GigabitEthernet0/0/1 current state : UP
Line protocol current state : UP
Description:
Switch Port, PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 4c1f-cc3a-3b57 
......

2、华三交换机S5800接口PVID：

[h3c-s5800]dis interface GigabitEthernet 0/0/1
GigabitEthernet0/0/1
Current state: up
Line protocol state: up
IP packet frame type: Ethernet II, hardware address: 000c-2963-b767
Description: GigabitEthernet0/0/1 Interface
Bandwidth: 100000 kbps
Loopback is not set
Media type is twisted pair, port hardware type is 1000_BASE_T_AN_SFP
Unknown-speed mode, unknown-duplex mode
Link speed type is autonegotiation, link duplex type is autonegotiation
Flow-control is not enabled
Maximum frame length: 9216
Allow jumbo frame to pass
Broadcast max-ratio: 100%
Unknown-multicast max-ratio: 100%
Unicast max-ratio: 100%
PVID: 1
Port link-type: Trunk 
Tagged VLANs:   None 
.....

结论：两端交换机pvid都是vlan 1。

四、全局查看配置
1、华为交换机S5700接口配置：

<hw-s5700>dis curr
#
sysname hw-s5700#vlan batch 10 20 30 40 50......
#
interface GigabitEthernet0/0/1 
port link-type trunk 
port trunk allow-pass vlan 2 to 4094
#
......

2、华三交换机S5800接口配置：

[h3c-s5800]dis curr 
#
sysname h3c-s5800
#
vlan batch 10 20 30 40 50
......
#
interface GigabitEthernet0/0/1 
port link-type trunk 
port trunk permit vlan all
#
......

结论：华为交换机上虽然配置为allow-pass vlan all，但是在接口下显示却是只允许vlan 2-4094通过！经过确认为针对华为这个pvid vlan ，类似于Cisco的native vlan，交换机对其的处理方式为出数据剥离标签，所以导致两个交换机不能正常通信，于是需要更改两侧的pvid vlan。

五、修改配置
1、华为交换机S5700修改配置：

[hw-s5700] interface GigabitEthernet0/0/1
[hw-s5700-GigabitEthernet0/0/1]port link-type trunk
[hw-s5700-GigabitEthernet0/0/1]port trunk pvid vlan 10
[hw-s5700-GigabitEthernet0/0/1]port trunk allow-pass vlan 2-4094

2、华三交换机S5800修改配置：

[h3c-s5800] interface GigabitEthernet0/0/1
[h3c-s5800-GigabitEthernet0/0/1]port link-type trunk
[h3c-s5800-GigabitEthernet0/0/1]undo port trunk permit vlan 1
[h3c-s5800-GigabitEthernet0/0/1]port trunk permit vlan 2 to 4094
[h3c-s5800-GigabitEthernet0/0/1]port trunk pvid vlan 10

结论：修改后，可正常通信。

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