问题描述：
交换机划vlan等配置，终端可以获取到地址但无法上网，也无法ping网关，在CRT内可以ping通，将20端口配置acc后一样能过去地址，无法ping网关。 请教一下这个问题出在哪里？之前一直可以上网，昨天突发网络故障。
******************************************************************************
* Copyright (c) 2004-2020 New H3C Technologies Co., Ltd. All rights reserved.*
* Without the owner's prior written consent, *
* no decompiling or reverse-engineering shall be allowed. *
******************************************************************************
<HX>
<HX>%Jan 1 11:45:28:142 2013 HX SHELL/5/SHELL_LOGIN: TTY logged in from aux0.
<HX>sys
System View: return to User View with Ctrl+Z.
[HX]show run
[HX]display run
^
% Unrecognized command found at '^' position.
[HX]dis%Jan 1 11:45:42:268 2013 HX STP/6/STP_DETECTED_TC: Instance 0's port GigabitEthernet1/0/20 detected a topology change.
cur
#
version 7.1.070, Release 6312P01
#
sysname HX
#
telnet server enable
#
irf mac-address persistent timer
irf auto-update enable
undo irf link-delay
irf member 1 priority 1
#
dhcp enable
#
dhcp snooping enable
#
lldp global enable
#
password-recovery enable
#
vlan 1
#
vlan 10
description TO-JK
#
vlan 20
description TO-GB
#
vlan 100
description TO-WL
#
vlan 110
description TO-Wifi
#
vlan 1000
description GL
#
stp global enable
#
dhcp server ip-pool vlan100
gateway-list 192.168.100.1
network 192.168.100.0 mask 255.255.255.0
dns-list 114.114.114.114
expired day 0 hour 8
#
dhcp server ip-pool vlan110
gateway-list 192.168.110.1
network 192.168.110.0 mask 255.255.255.0
dns-list 114.114.114.114
expired day 0 hour 4
#
dhcp server ip-pool vlan1000
gateway-list 192.168.134.1
network 192.168.134.0 mask 255.255.255.0
address range 192.168.134.100 192.168.134.200
dns-list 114.114.114.114
#
interface NULL0
#
interface Vlan-interface10
description TO-JK
ip address 192.168.1.1 255.255.255.0
#
interface Vlan-interface20
description TO-GB
ip address 192.168.10.1 255.255.255.0
#
interface Vlan-interface100
description TO-WL
ip address 192.168.100.1 255.255.255.0
#
interface Vlan-interface110
description TO-Wifi
ip address 192.168.110.1 255.255.255.0
#
interface Vlan-interface1000
description GL
ip address 192.168.134.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/2
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/3
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/4
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/5
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/6
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/7
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/8
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/9
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/10
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/11
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/12
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/13
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
#
interface GigabitEthernet1/0/14
port link-mode bridge
#
interface GigabitEthernet1/0/15
port link-mode bridge
#
interface GigabitEthernet1/0/16
port link-mode bridge
#
interface GigabitEthernet1/0/17
port link-mode bridge
port access vlan 1000
combo enable auto
#
interface GigabitEthernet1/0/18
port link-mode bridge
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 2 to 4094
combo enable auto
#
interface GigabitEthernet1/0/19
port link-mode bridge
combo enable auto
#
interface GigabitEthernet1/0/20
port link-mode bridge
port access vlan 100
combo enable copper
#
interface GigabitEthernet1/0/21
port link-mode bridge
combo enable auto
#
interface GigabitEthernet1/0/22
port link-mode bridge
combo enable auto
#
interface GigabitEthernet1/0/23
port link-mode bridge
combo enable auto
#
interface GigabitEthernet1/0/24
port link-mode bridge
port access vlan 20
combo enable auto
#
interface M-GigabitEthernet0/0/0
ip address 200.200.200.1 255.255.255.0
#
interface Ten-GigabitEthernet1/0/25
port link-mode bridge
#
interface Ten-GigabitEthernet1/0/26
port link-mode bridge
#
interface Ten-GigabitEthernet1/0/27
port link-mode bridge
#
interface Ten-GigabitEthernet1/0/28
port link-mode bridge
#
scheduler logfile size 16
#
line class aux
user-role network-admin
#
line class usb
user-role network-admin
#
line class vty
user-role network-operator
#
line aux 0
user-role network-admin
#
line vty 0 63
authentication-mode scheme
user-role network-operator
#
ip route-static 0.0.0.0 0 192.168.134.254
#
ssh server enable
#
radius scheme system
user-name-format without-domain
#
domain system
#
domain default enable system
#
role name level-0
description Predefined level-0 role
#
role name level-1
description Predefined level-1 role
#
role name level-2
description Predefined level-2 role
#
role name level-3
description Predefined level-3 role
#
role name level-4
description Predefined level-4 role
#
role name level-5
description Predefined level-5 role
#
role name level-6
description Predefined level-6 role
#
role name level-7
description Predefined level-7 role
#
role name level-8
description Predefined level-8 role
#
role name level-9
description Predefined level-9 role
#
role name level-10
description Predefined level-10 role
#
role name level-11
description Predefined level-11 role
#
role name level-12
description Predefined level-12 role
#
role name level-13
description Predefined level-13 role
#
role name level-14
description Predefined level-14 role
#
user-group system
#
local-user admin class manage
password hash $h$6$BwMSrYyCzaVkVUba$7B7izxXCYcYbm95aCM4epUzySlXqQKRVgduQKOQru2rzJWkZBc75oh01Sb/Qi3tIXidxOCyuLGl/eqNdbcsxmA==
service-type telnet https ssh
authorization-attribute user-role level-15
authorization-attribute user-role network-operator
#
ip https enable
#
cloud-management server domain oasis.h3c.com
#
return
[HX]
组网及组网描述：
F1000-c812防火墙连接s5500v2到接入段交换机
这个得看下网关是在防火墙还是在交换机上了，在防火墙上的话，是不是没有允许ping，需要检查防火墙的NAT，以及安全策略。如果网关DHCP在交换机上，那理论不应该ping不通交换机的。
表述的故障信息都是这一台交换机，现在将20口改成了ACC，绑100地址段，网关100.1是PING 不通的
[HX]ping 192.168.100.1 Ping 192.168.100.1 (192.168.100.1): 56 data bytes, press CTRL+C to break 56 bytes from 192.168.100.1: icmp_seq=0 ttl=255 time=0.550 ms 56 bytes from 192.168.100.1: icmp_seq=1 ttl=255 time=0.382 ms 56 bytes from 192.168.100.1: icmp_seq=2 ttl=255 time=0.392 ms 56 bytes from 192.168.100.1: icmp_seq=3 ttl=255 time=0.418 ms 56 bytes from 192.168.100.1: icmp_seq=4 ttl=255 time=0.381 ms --- Ping statistics for 192.168.100.1 --- 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss CRT工具登陆可以正常PING ，但通过接口终端就不行，很奇怪的一件事
看看mac地址学习情况，以及ARP学习情况，要么就是电脑网卡的问题。或者电脑发起ping的方式有问题，带源地址ping
排查步骤：
1. 检查终端ARP表
在终端上执行arp -a，看网关IP对应的MAC地址是否正确。如果显示“不完整”或错误MAC，说明ARP解析失败。
2. 检查交换机ARP表
在交换机上执行display arp，确认网关IP对应的MAC与终端实际MAC是否一致。若不一致，可能存在IP冲突或ARP欺骗。
3. 检查端口安全与过滤
执行display port-security和display packet-filter，确认20端口及终端所接端口是否配置了安全策略或ACL，导致丢弃终端发出的报文。
4. 检查STP状态
执行display stp brief，确认终端所接端口是否处于Discarding状态。若端口被STP阻塞，终端报文无法到达网关。
5. 检查VLAN配置
执行display vlan brief，确认终端所接端口所在VLAN与网关VLAN一致，且VLAN接口状态为UP。
6. 检查终端网关地址
确认终端获取的网关地址与交换机VLAN接口地址一致，子网掩码正确。
7. 抓包定位
在终端所接端口配置镜像，抓取终端发出的ARP请求和ICMP报文，确认报文是否到达交换机、交换机是否回应。
关键命令：
display arp
display stp brief
display vlan brief
display port-security
display packet-filter interface GigabitEthernet1/0/20
常见原因：终端ARP表错误、端口安全触发、STP拓扑变化导致端口阻塞、或终端侧防火墙拦截。建议先清终端ARP缓存（arp -d）并重启终端网卡测试。
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看看mac地址学习情况，以及ARP学习情况，要么就是电脑网卡的问题。或者电脑发起ping的方式有问题，带源地址ping