1,设备做DHCP中继,终端获取到地址,
2,设备做核心交换机,有另外的DHCP SERVER,核心下挂接入,通过聚合口和接入连接
处理过程
1,问题是vlan 117下的用户无法获取地址,
2,终端上抓包,有发送discover报文,收不到offer报文,
3,设备上debug查看,有发送offer报文,
Aug 31 2018 14:50:07.800.6-05:13 HRB-G-WGANG-5710-S1 DHCP/7/DEBUG:[DHCPR-pkt]:Send DHCP OFFER to client.(Chaddr=0004-a374-a230, Yiaddr=10.150.172.108).
Aug 31 2018 15:05:09.560.6-05:13 HRB-G-WGANG-5710-S1 DHCP/7/DEBUG:[DHCP-pkt]:Unicast packet to interface Eth-Trunk1 within VLAN 53(pri:0) succeed!
4,设备已经发出了offer报文,但在debug信息中发现报文是通过vlan 53发出去的,不是客户描述的vlan 117,核查设备配置:
5,配置如下:
interface Vlanif117
ip binding vpn-instance VPN-dianli
ip address 10.150.172.1 255.255.252.0
dhcp select relay
dhcp relay server-select enus
interface Eth-Trunk1
description TO TO_HRB-A-WGANG-MA5800-OS1
qinq vlan-translation enable
port hybrid tagged vlan 52 55 to 59 107 117 123 126 to 128
port vlan-mapping vlan 54 map-vlan 107
port vlan-mapping vlan 53 map-vlan 117
port vlan-mapping vlan 59 map-vlan 123
port vlan-mapping vlan 60 map-vlan 127
mode lacp
接口使用的hubrid模式,透传了vlan 117,但接口下有配置vlan-mapping,将vlan 53映射到了vlan 117,没有透传vlan 53
6,放行vlan 53后正常
解决方案
透传vlan 53后解决