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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Configuring MLD SSM mappings 
By performing this configuration multiple times, you can map an IPv6 multicast group to different IPv6 
multicast sources. 
If MLDv2 is enabled on a VLAN interface of a switch , and if a port in that VLAN is configured as a 
simulated host, the simulated host will send MLDv2 repo rts even if you did not specify an IPv6 multicast 
source when you configure simulated joining with the  mld-snooping host-join c o m m a n d.  I n  t h i s  c a s e,  t h e  
corresponding IPv6 multicast group will not be created based on the configured MLD SSM mappings. 
For more information about the  mld-snooping host-join command, see IP Multicast Command Reference . 
To configure an MLD SSM mapping: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter MLD view. 
mld  N/A 
3.  Configure an MLD SSM 
mapping.  ssm-mapping 
ipv6-group-address 
prefix-length ipv6-source-address  No MLD mappings are configured 
by default. 
 
Configuring MLD proxying 
Configuration prerequisites 
Before you configure the MLD proxying feature, complete the following tasks: 
•
  Enable IPv6 forwarding and configure an IPv6 unic ast routing protocol so that all devices in the 
domain are interoperable at the network layer. 
•   Enable IPv6 multicast routing. 
Enabling MLD proxying 
You can enable MLD proxying on the interface in the direction toward the root of the multicast forwarding 
tree to make the device serve as an MLD proxy.  
Configuration guidelines 
•  Each device can have only one interface serving as the MLD proxy interface. 
•   You cannot enable MLD on interfaces with MLD proxying enabled. Moreover, only the  mld 
require-router-alert , mld send-router-alert , and mld version commands can take effect on such 
interfaces.  
•   You cannot enable other IPv6 multicast routing protocols (such as IPv6 PIM-DM or IPv6 PIM-SM) on 
interfaces with MLD proxying enabled, or vice versa. However, the  source-lifetime, source-policy , 
and ssm-policy  commands configured in IPv6 PIM view can still take effect. 
•   You cannot enable MLD proxying on a VL AN inter face with MLD snooping enabled, or vice versa. 
Configuration procedure 
To enable MLD proxying:
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Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface
 interface-type 
interface-number  N/A 
3.
  Enable the MLD proxying 
feature.  mld proxying enable 
Disabled by default 
 
Configuring IPv6 multicast forwarding on a downstream 
interface 
Typically, to avoid duplicate multicast flows, only queriers can forward IPv6 multicast traffic. On MLD 
proxy devices, a downstream interface must be a querier in order to forward IPv6 multicast traffic to 
downstream hosts. If the interface has failed in the querier election, you must manually enable IPv6 
multicast forwarding on this interface.  
 
 IMPORTANT: 
On a multi-access network with more than one MLD proxy devices, you cannot enable IPv6 multicast 
forwarding on any other non-querier downstream inte
rface after one of the downstream interfaces of 
these MLD proxy devices has been elected as the  querier. Otherwise, duplicate multicast flows mi
ght be 
received on the multi-access network.  
To enable IPv6 multicast forwarding on a downstream interface  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Enable IPv6 multicast forwarding 
on a non-querier downstream 
interface.  mld proxying forwarding
 Disabled by default 
 
Displaying and maintaining MLD  
 
Task
  Command  Remarks 
Display MLD group information.
 display mld group 
[ ipv6-group-address 
| interface  
interface-type interface-number  ] 
[ static  | verbose  ] [ | { begin | 
exclude  | include  } 
regular-expression  ]
  Available in any view
 
Display Layer 2 port information 
about MLD groups.
 display mld group port-info
 [ vlan 
vlan-id  ] [ slot  slot-number  ] 
[ verbose  ] [ | { begin |  exclude | 
include  } regular-expression ]
 Available in any view
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Task  Command  Remarks 
Display information about the hosts 
tracked by MLD on an interface.  display mld host interface 
interface-type interface-number
 
group  ipv6-group-address  [ source 
ipv6-source-address  ] [ | { begin  | 
exclude  | include  } 
regular-expression  ]  Available in any view 
Display information about the hosts 
tracked by MLD on the Layer 2 
ports.  display mld host port-info
 vlan  
vlan-id  group  ipv6-group-address  
[ source  ipv6-source-address ] 
[ vlan  vlan-id  ] [ slot  slot-number  ] 
[ |  { begin |  exclude | include } 
regular-expression  ]  Available in any view 
Display MLD configuration and 
running information on the 
specified interface or all 
MLD-enabled interfaces.
 display mld interface 
[ interface-type interface-number 
] 
[  verbose  ] [ | { begin |  exclude | 
include  } regular-expression ]
 Available in any view
 
Display the information of the MLD 
proxying groups.  display mld proxying
 group 
[  group-address  ] [ verbose ] [  | 
{  begin |  exclude | include  } 
regular-expression  ]  Available in any view 
Display the information of the MLD 
routing table.
  display mld routing-table 
[ ipv6-source-address
 
[ prefix-length ] | 
ipv6-group-address  [ prefix-length ] 
|  flags  { act  | suc  } ] * [  | { begin  | 
exclude  | include  } 
regular-expression  ]
  Available in any view
 
Display MLD SSM mappings.  display mld
 ssm-mapping  
ipv6-group-address  [ | { begin | 
exclude  | include  } 
regular-expression  ]  Available in any view 
Display the IPv6 multicast group 
information created based on the 
configured MLD SSM mappings.  display mld
 ssm-mapping  group  
[ ipv6-group-address  | interface  
interface-type  interface-number  ] 
[ verbose  ] [ | { begin |  exclude | 
include  } regular-expression ]  Available in any view 
Display information about the hosts 
that join based on the MLD SSM 
mappings on an interface.  display mld
 ssm-mapping host 
interface  interface-type 
interface-number  group  
ipv6-group-address  source 
ipv6-source-address  [ | { begin | 
exclude  | include  } 
regular-expression  ]  Available in any view 
Remove the dynamic group entries 
of a specified MLD group or all 
MLD groups.
  reset mld group 
{ all  |  interface  
interface-type interface-number 
{  all  | ipv6-group-address 
[  prefix-length  ] 
[ ipv6-source-address 
[ prefix-length ] ] } }  Available in user view
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Task  Command  Remarks 
Remove the dynamic Layer 2 port 
entries of a specified MLD group or 
all MLD groups.  reset mld group port-info
 { all | 
ipv6-group-address  } [ vlan 
vlan-id  ]  Available in user view 
Clear MLD SSM mappings.  reset mld ssm-mapping group 
{ all  
|  interface  interface-type 
interface-number {  all | 
ipv6-group-address  [ prefix-length  ] 
[ ipv6-source-address 
[ prefix-length ] ] } }  Available in user view 
 
 
IMPORTANT: 
The 
reset mld group  command might cause an interruption of  receivers’ reception of multicast data. 
 
The reset  mld group  command cannot remove dynamic MLD group entries. 
The  reset mld group port-info  command cannot remove the Layer 2 port entries of MLD groups.  
The  display mld host interface command can display information about the hosts tracked by MLD on 
Layer 3 interfaces other than VLAN interfaces. 
The  display mld ssm-mapping host interface  command can display information about the hosts that join 
the group based on MLD SSM mappings on Layer 3 interfaces other than VLAN interfaces. 
MLD configuration examples 
Basic MLD functions configuration example 
Network requirements 
As shown in Figure 87 , receivers receive VOD information in the multicast mode. Receivers of different 
organizations form stub networks N1 and N2, and Host A and Host C are multicast receivers in N1 and 
N2 respectively. 
MLDv1 runs between Switch A and N1. MLDv1 runs be tween the other two switches (Switch B and Switch 
C) and N2. Switch B acts as the MLD querier because it has a lower IPv6 address. 
The hosts in N1 can join only IPv6 multicast group FF1E::101, and the hosts in N2 can join any IPv6 
multicast groups.
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Figure 87 Network diagram 
 
 
Configuration procedure 
1. Enable IPv6 forwarding and configure IPv6 addresses and IPv6 unicast routing: 
Enable IPv6 forwarding on each switch and conf igure an IP address and prefix length for each 
interface as shown in  Figure 87. (Details not shown.) 
Conf

igure OSPFv3 for interoperation between the switches. Ensure the network-layer 
interoperation among the switch es on the IPv6 PIM network and dynamic update of routing 
information between the switches through a unic ast routing protocol. (Details not shown.)  
2. Enable the IPv6 multicast routing, and enable IPv6 PIM-DM and MLD: 
# Enable IPv6 multicast routing on Switch A, enable IPv6 PIM-DM on each interface, and enable 
MLD on VLAN-interface 100. 
 system-view 
[SwitchA] multicast ipv6 routing-enable 
[SwitchA] interface vlan-interface 100 
[SwitchA-Vlan-interface100] mld enable 
[SwitchA-Vlan-interface100] pim ipv6 dm 
[SwitchA-Vlan-interface100] quit 
[SwitchA] interface vlan-interface 101 
[SwitchA-Vlan-interface101] pim ipv6 dm 
[SwitchA-Vlan-interface101] quit 
# Enable IPv6 multicast routing on Switch B, en able IPv6 PIM-DM on each interface, and enable 
MLD on VLAN-interface 200. 
 system-view 
[SwitchB] multicast ipv6 routing-enable 
[SwitchB] interface vlan-interface 200 
[SwitchB-Vlan-interface200] mld enable 
[SwitchB-Vlan-interface200] pim ipv6 dm 
[SwitchB-Vlan-interface200] quit 
Switch A
Switch B
Switch C Querier
N1
N2
Receiver Receiver
Host A
Host B
Host C
Host DVlan-int100
3000::12/64
Vlan-int200
3001::10/64
Vlan-int200
3001::12/64
Vlan-int101
Vlan-int201
Vlan-int202
IPv6 PIM network
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[SwitchB] interface vlan-interface 201 
[SwitchB-Vlan-interface201] pim ipv6 dm 
[SwitchB-Vlan-interface201] quit 
# Enable IPv6 multicast routing on Switch C, enable IPv6 PIM-DM on each interface, and enable 
MLD on VLAN-interface 200. 
 system-view 
[SwitchC] multicast ipv6 routing-enable 
[SwitchC] interface vlan-interface 200 
[SwitchC-Vlan-interface200] mld enable 
[SwitchC-Vlan-interface200] pim ipv6 dm 
[SwitchC-Vlan-interface200] quit 
[SwitchC] interface vlan-interface 202 
[SwitchC-Vlan-interface202] pim ipv6 dm 
[SwitchC-Vlan-interface202] quit 
3. Configure an IPv6 multicast group filter: 
# Configure an IPv6 multicast group filter on  Switch A, so that the hosts connected to 
VLAN-interface 100 can join IPv6 multicast group FF1E::101 only. 
[SwitchA] acl ipv6 number 2001 
[SwitchA-acl6-basic-2001] rule permit source ff1e::101 128 
[SwitchA-acl6-basic-2001] quit 
[SwitchA] interface vlan-interface 100 
[SwitchA-Vlan-interface100] mld group-policy 2001 
[SwitchA-Vlan-interface100] quit 
4.  Verify the configuration: 
Use the  display mld interface  command to display the MLD configuration and running information 
on each switch interface. Example: 
# Display MLD information on VLAN-interface 200 of Switch B. 
[SwitchB] display mld interface vlan-interface 200 
 Vlan-interface200(FE80::200:5EFF:FE66:5100): 
   MLD is enabled 
   Current MLD version is 1 
   Value of query interval for MLD(in seconds): 125 
   Value of other querier present interval for MLD(in seconds): 255 
   Value of maximum query response time for MLD(in seconds): 10 
   Querier for MLD: FE80::200:5EFF:FE66:5100 (this router) 
  Total 1 MLD Group reported 
MLD SSM mapping configuration example 
Network requirements 
As shown in  Figure 88, the IPv6 P IM-SM domain applies both the ASM model and SSM model for IPv6 
multicast delivery. Switch D’s VLAN-interface 104 serves as the C-BSR and C-RP. The SSM group range 
is FF3E::/64. 
MLDv2 runs on Switch D’s VLAN-interface 400. The receiver host runs MLDv1, and does not support 
MLDv2. Therefore, the Receiver host cannot specify expected multicast sources in its membership reports.
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So u rc e  1,  So u rc e  2,  a n d  So u rc e  3  s e n d  I P v6  mu l t ic as t  p a cke t s  to  mu l t ic as t  g rou ps  i n  t h e  I P v 6  SS M  g rou p  
range. You can configure the MLD SSM mapping feature on Switch D so that the receiver host will receive 
IPv6 multicast data from Source 1 and Source 3 only.  
Figure 88 Network diagram 
 
Device  Interface  IPv6 address  Device   Interface  IPv6 address  
Source 1  —  1001::1/64 Source 3 —  3001::1/64 
Source 2  —  2001::1/64 Receiver —  4001::1/64  
Switch A  Vlan-int100 1001::2/64 Switch C Vlan-int300 3001::2/64 
  Vlan-int101 1002::1/64   Vlan-int103 3002::1/64 
 Vlan-int104 1003::1/64   Vlan-int102 2002::2/64  
Switch B  Vlan-int200 2001::2/64 Switch D Vlan-int400 4001::2/64 
  Vlan-int101 1002::2/64    Vlan-int103 3002::2/64 
  Vlan-int102 2002::1/64    Vlan-int104 1003::2/64   
 
Configuration procedure 
1. Enable IPv6 forwarding and configure IPv6 addresses and IPv6 unicast routing: 
Enable IPv6 forwarding on each switch and config ure an IPv6 address and prefix length for each 
interface as shown in  Figure 88. (Details not shown.) 
Configu

re OSPFv3 for interoperability amon g the switches. Ensure the network-layer 
interoperation on the IPv6 PIM-SM domain and  dynamic update of routing information among the 
switches through an IPv6 unicast routing protocol. (Details not shown.) 
2.  Enable IPv6 multicast routing, enable IPv6 PIM- SM on each interface and enable MLD and MLD 
SSM mapping on the host-side interface: 
# Enable IPv6 multicast routing on Switch D, en able IPv6 PIM-SM on each interface, and enable 
MLD (version 2) and MLD SSM m apping on VLAN-interface 400. 
 system-view 
[SwitchD] multicast ipv6 routing-enable 
[SwitchD] interface vlan-interface 400 
[SwitchD-Vlan-interface400] mld enable 
[SwitchD-Vlan-interface400] mld version 2 
[SwitchD-Vlan-interface400] mld ssm-mapping enable 
[SwitchD-Vlan-interface400] pim ipv6 sm 
[SwitchD-Vlan-interface400] quit
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[SwitchD] interface vlan-interface 103 
[SwitchD-Vlan-interface103] pim ipv6 sm 
[SwitchD-Vlan-interface103] quit 
[SwitchD] interface vlan-interface 104 
[SwitchD-Vlan-interface104] pim ipv6 sm 
[SwitchD-Vlan-interface104] quit 
# Enable IPv6 multicast routing on Switch A, and enable IPv6 PIM-SM on each interface. 
 system-view 
[SwitchA] multicast ipv6 routing-enable 
[SwitchA] interface vlan-interface 100 
[SwitchA-Vlan-interface100] pim ipv6 sm 
[SwitchA-Vlan-interface100] quit 
[SwitchA] interface vlan-interface 101 
[SwitchA-Vlan-interface101] pim ipv6 sm 
[SwitchA-Vlan-interface101] quit 
[SwitchA] interface vlan-interface 104 
[SwitchA-Vlan-interface104] pim ipv6 sm 
[SwitchA-Vlan-interface104] quit 
The configuration on Switch B and Switch C is similar to that on Switch A. 
3. Configure a C-BSR and a C-RP: 
# Configure C-BSR and C-RP interfaces on Switch D. 
[SwitchD] pim ipv6 
[SwitchD-pim6] c-bsr 1003::2 
[SwitchD-pim6] c-rp 1003::2 
[SwitchD-pim6] quit 
4. Configure the IPv6 SSM group range: 
# Configure the IPv6 SSM group range FF3E::/64 on Switch D. 
[SwitchD] acl ipv6 number 2000 
[SwitchD-acl6-basic-2000] rule permit source ff3e:: 64 
[SwitchD-acl6-basic-2000] quit 
[SwitchD] pim ipv6 
[SwitchD-pim6] ssm-policy 2000 
[SwitchD-pim6] quit 
The configuration on Switch A, Switch B and Switch C is similar to that on Switch D. 
5. Configure MLD SSM mappings: 
# Configure MLD SSM mappings on Switch D. 
[SwitchD] mld 
[SwitchD-mld] ssm-mapping ff3e:: 64 1001::1 
[SwitchD-mld] ssm-mapping ff3e:: 64 3001::1 
[SwitchD-mld] quit 
6. Verify the configuration: 
# Display MLD SSM mapping information about the IPv6 multicast group FF3E::101 on Switch D. 
[SwitchD] display mld ssm-mapping ff3e::101 
Group: FF3E::101 
Source list: 
       1001::1
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       3001::1 
# Display the IPv6 multicast group information created based on the configured MLD SSM 
mappings on Switch D. 
[SwitchD] display mld ssm-mapping group 
Total 1 MLD SSM-mapping Group(s). 
Interface group report information 
 Vlan-interface400 (4001::2): 
  Total 1 MLD SSM-mapping Group reported 
   Group Address: FF3E::101 
    Last Reporter: 4001::1 
    Uptime: 00:02:04 
    Expires: off 
# Display the IPv6 PIM routing table information on Switch D. 
[SwitchD] display pim ipv6 routing-table 
Total 0 (*, G) entry; 2 (S, G) entry 
 
 (1001::1, FF3E::101) 
     Protocol: pim-ssm, Flag: 
     UpTime: 00:13:25 
     Upstream interface: Vlan-interface104 
         Upstream neighbor: 1003::1 
         RPF prime neighbor: 1003::1 
     Downstream interface(s) information: 
       Total number of downstreams: 1 
         1: Vlan-interface400 
                 Protocol: mld, UpTime: 00:13:25, Expires: - 
 
 (3001::1, FF3E::101) 
     Protocol: pim-ssm, Flag: 
     UpTime: 00:13:25 
     Upstream interface: Vlan-interface103 
         Upstream neighbor: 3002::1 
         RPF prime neighbor: 3002::1 
     Downstream interface(s) information: 
       Total number of downstreams: 1 
         1: Vlan-interface400 
                 Protocol: mld, UpTime: 00:13:25, Expires: - 
MLD proxying configuration example 
Network requirements 
As shown in  Figure 89, IPv6 PIM-DM runs on the core network. Host A and Host C in the stub network 
receive VOD information destined to multicast group FF3E::101.  
Configure the MLD proxying feature on Switch B so that Switch B can maintain group memberships and 
forward IPv6 multicast traffic without running IPv6 PIM-DM.
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Figure 89 Network diagram  
 
Configuration procedure 
1. Enable IPv6 forwarding and co nfigure the IPv6 addresses: 
Enable IPv6 forwarding on each switch and configure the IPv6 address and prefix length of each 
interface as per  Figure 89. (Details not 
 shown.)  
2. Enable IPv6 multicast routing, IP v6 PIM-DM, MLD, and MLD proxying: 
# Enable IPv6 multicast routing on Switch A, IPv6 PIM-DM on VLAN-interface 101, and MLD on 
VLAN-interface 100.  
 system-view 
[SwitchA] multicast ipv6 routing-enable 
[SwitchA] interface vlan-interface 101 
[SwitchA-Vlan-interface101] pim ipv6 dm 
[SwitchA-Vlan-interface101] quit 
[SwitchA] interface vlan-interface 100 
[SwitchA-Vlan-interface100] mld enable 
[SwitchA-Vlan-interface100] pim ipv6 dm 
[SwitchA-Vlan-interface100] quit 
# Enable IPv6 multicast routing on Switch B, MLD proxying on VLAN-int erface 100, and MLD on 
VLAN-interface 200. 
 system-view 
[SwitchB] multicast ipv6 routing-enable 
[SwitchB] interface vlan-interface 100 
[SwitchB-Vlan-interface100] mld proxying enable 
[SwitchB-Vlan-interface100] quit 
[SwitchB] interface vlan-interface 200 
[SwitchB-Vlan-interface200] mld enable 
[SwitchB-Vlan-interface200] quit 
3.  Verify the configuration: 
# Display MLD configuration and operation inform ation on VLAN-interface 100 of Switch B.  
[SwitchB] display mld interface vlan-interface 100 verbose 
 Vlan-interface100(2001::2): 
   MLD proxy is enabled 
   Current MLD version is 1 
   Multicast routing on this interface: enabled
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