ipoe-server multi-sessions per-mac enable

Function

The ipoe-server multi-sessions per-mac enable command enables one-to-many mapping between one MAC address and many sessions to allow a device to assign IP addresses to DHCPv4, DHCPv6, and ND users with the same MAC address.

The undo ipoe-server multi-sessions per-mac enable command disables one-to-many mapping between one MAC address and many sessions of DHCPv4, DHCPv6, and ND users.

By default, one-to-many mapping between one MAC address and many sessions is disabled, and the device assigns IP addresses only to DHCPv4, DHCPv6, and ND users with different MAC addresses.

This command is supported only on the NetEngine 8000 F1A.

Format

ipoe-server multi-sessions per-mac enable

undo ipoe-server multi-sessions per-mac enable

Parameters

None

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bras-control	write

Usage Guidelines

Usage Scenario

By default, the device that functions as a BRAS or DHCP server assigns IP addresses only to DHCPv4, DHCPv6, and ND users with different MAC addresses. To allow the device to assign IP addresses to DHCPv4, DHCPv6, and ND users with the same MAC address, run the ipoe-server multi-sessions per-mac enable command. The device then assigns different session IDs to the users with the same MAC address, and the users are identified by these session IDs.

When the device functions as a BRAS, users with the same MAC address must go online through different VLANs or interfaces. Packets from these users can carry Option 82 or not. However, if the user packets carry Option 82, they must carry different Option 82 field values.

When the device functions as a network-side DHCP server, packets from users with the same MAC address must carry different Option 82 field values.

Prerequisites

No DHCPv4, DHCPv6, or ND users are online or available in RUI scenarios.

Precautions

This command is supported only on the admin VS.

After one-to-many mapping between one MAC address and multiple sessions is enabled for IPoE users, note the following restrictions:

EAP authentication and RADIUS proxy are not supported.
A PPPoE user cannot preferentially go online when the PPPoE user and an IPoE user with the same MAC address request to go online at the same time.
A DHCP server cannot proactively send DHCP response packets to clients.
In remote address pool scenarios, if the DHCP server does not support one-to-many mapping between one MAC address and multiple sessions, users may fail to go online.
The function to log out an online dynamic IPv6 user when a static IPv6 user with the same MAC address request to go online is not supported.
IPv6 multicast is not supported.
WLAN roaming is not supported.
This command is mutually exclusive with the static-bind ip-address command in the IPv4 address pool view.
This command is mutually exclusive with the client-duid bind prefix command in the IPv6 delegation prefix pool view.
When automatic backup of DHCPv4 user information and one-to-many mapping between one MAC address and many sessions for users are both used, note the following:
When automatic backup of DHCPv4 user information is enabled, changing the one-to-many mapping between one MAC address and many sessions for users clears all autosave entries in the memory.
For autosave files that are saved when the one-to-many mapping between one MAC address and many sessions for users is enabled, after the one-to-many mapping is disabled, only one user from the multiple users using the same MAC address saved in the autosave files can go online.
For autosave files that are saved when the one-to-many mapping between one MAC address and many sessions for users is disabled, after the one-to-many mapping is enabled, users whose Option 82 information is not saved in the autosave files cannot go online by sending packets.
The ipoe-server multi-sessions per-mac enable, ipv6-pool address-assign-mode eui-64, and dhcpv6-server destination commands cannot be configured at the same time.
If the Option 82 field carried in the Request packet is inconsistent with that carried in the Discover packet, users fail to go online.
When IPoE one-MAC-address-to-multiple-sessions-mapping is enabled, the addresses reserved for non IPoE one-MAC-address-to-multiple-sessions-mapping users are not proactively reclaimed. When users go online again, IP addresses are assigned to the new one-MAC-address-to-multiple-sessions-mapping users, and the addresses reserved before IPoE one-MAC-address-to-multiple-sessions-mapping is configured are not used. After the IPoE one-MAC-address-to-multiple-sessions-mapping is disabled, when users go online again, the reserved addresses can be used.

Example

# Enable one-to-many mapping between one MAC address and many sessions of DHCPv4, DHCPv6, and ND users.

<HUAWEI> system-view
[~HUAWEI] ipoe-server multi-sessions per-mac enable
Warning: IPoE multi-sessions need the same MAC users with different option82. Continue? [Y/N]:Y