M9000 L2TP本地账号只允许拨号一次

M9000配置：

#
ip pool vpdn 58.113.118.241 58.113.118.253
ip pool vpdn gateway 58.113.118.254
#
domain h3c
authorization-attribute ip-pool vpdn
accounting start-fail offline
accounting update-fail offline
authentication ppp local
authorization ppp local
accounting ppp local
#
interface Virtual-Template1
ppp authentication-mode pap chap
#
l2tp enable
#
l2tp-group 1 mode lns
allow l2tp virtual-template 1
undo tunnel authentication
#
local-user testn class network
password cipher $c$3$WpR3gUHDujjRQ==
access-limit 1
service-type ppp
authorization-attribute user-role network-admin
authorization-attribute user-role network-operator
authorization-attribute ip 58.113.118.249
#

测试发现，上述配置下，多个PC可以使用1个账号成功进行L2TP拨号，也就是说上述配置无法实现1个账号只能拨1次的效果。

[M9000]dis ppp access-user username testn@h3c
Basic:
Interface: VA0
User ID: 0x28000001
Username: testn@h3c
Domain: h3c
IP address: 58.113.118.249
IPv6 address: -
IPv6 PD prefix: -
VPN instance: -
Access type: L2TP
Authentication type: CHAP

AAA:
Authentication state: Authenticated
Authorization state: Authorized
Realtime accounting switch: Closed
Realtime accounting interval: -
Login time: 2020-08-02 10:56:49:204
Accounting start time: -
Online time(hh:mm:ss): 00:39:23
Accounting state: Stop
Idle cut: 0 sec 0 byte
Session timeout: -
Time remained: -
Byte remained: -
Redirect WebURL: -

ACL&QoS:
User profile: -
User group profile: -
Inbound CAR: -
Outbound CAR: -

Flow Statistic:
IPv4 uplink packets/bytes: 0/0
IPv4 downlink packets/bytes: 0/0
IPv6 uplink packets/bytes: 0/0
IPv6 downlink packets/bytes: 0/0

Basic:
Interface: VA2
User ID: 0x28000003
Username: testn@h3c
Domain: h3c
IP address: 58.113.118.249
IPv6 address: -
IPv6 PD prefix: -
VPN instance: -
Access type: L2TP
Authentication type: PAP

AAA:
Authentication state: Authenticated
Authorization state: Authorized
Realtime accounting switch: Closed
Realtime accounting interval: -
Login time: 2020-08-02 11:36:05:317
Accounting start time: -
Online time(hh:mm:ss): 00:00:07
Accounting state: Stop
Idle cut: 0 sec 0 byte
Session timeout: -
Time remained: -
Byte remained: -
Redirect WebURL: -

ACL&QoS:
User profile: -
User group profile: -
Inbound CAR: -
Outbound CAR: -

Flow Statistic:
IPv4 uplink packets/bytes: 0/0
IPv4 downlink packets/bytes: 0/0
IPv6 uplink packets/bytes: 0/0
IPv6 downlink packets/bytes: 0/0

[M9000]