SNR S2940-8G-v2 Switch Configuration Guide
DHCPv6 option37, 38
for IPv6 address allocation if special server is used for uniform allocation and management for
IPv6 address. DHCPv6 server supports both stateful and stateless DHCPv6.
Network topology:
In access layer, layer2 access device Switch1 connects users in dormitory; in first-level aggre-
gation layer, aggregation device Switch2 is used as DHCPv6 relay agent; in second-level aggre-
gation layer, aggregation device Switch3 is used as DHCPv6 server and connects with backbone
network or devices in higher aggregation layer; in user side, PCs are generally loaded with Win-
dows Vista system, thus having DHCPv6 client.
Figure 38.2: DHCPv6 relay option schematic
Switch2 configuration:
S2(config)#service dhcpv6
S2(config)#ipv6 dhcp relay remote-id option
S2(config)#ipv6 dhcp relay subscriber-id option
S2(config)#vlan 10
S2(config-vlan10)#int vlan 10
S2(config-if-vlan10)#ipv6 address 2001:da8:1:::2/64
S2(config-if-vlan10)#ipv6 dhcp relay destination 2001:da8:10:1::1
S2(config-if-vlan10)#exit
38.4 DHCPv6 option37, 38 Troubleshooting
• Request packets sent by DHCPv6 client are multicast packets received by the device within
its VLAN, if DHCPv6 server wants to receive the packets from client, DHCPv6 client and
DHCPv6 server must be in the same VLAN, otherwise it needs to use DHCPv6 relay.
• Snooping option37,38 can process one of the following operations for DHCPv6 request pack-
ets with option37,38: replace the original option37,38 with its own; discard the packets with
option37,38; do not execute adding, discarding or forwarding operation. Therefore, please
check policy configuration of snooping option37,38 on second device when obtaining the
false address or no address is obtained according to option37,38.
• DHCPv6 server obtains option37,38 of the packets from client by default, if no, it will obtain
option37,38 of the packet sent by relay.
• DHCPv6 server only checks whether the first DHCPv6 relay adds option37,38 that means
only option37,38 of the innermost relay-forw is valid in relay packets.
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