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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Displaying and maintaining PIM snooping 
 
Task Command Remarks 
Display PIM snooping neighbor 
information. display pim-snooping neighbor
 
[ vlan  vlan-id  ] [ slot  slot-number  ] 
[ |  { begin |  exclude | include } 
regular-expression  ]  Available in any view
 
Display PIM snooping routing 
entries.  display pim-snooping 
routing-table
 [ vlan  vlan-id  ] [ slot 
slot-number  ] [ | { begin |  exclude 
|  include  } regular-expression  ] Available in any view
 
Display the statistics information of 
PIM messages learned by PIM 
snooping.  display pim-snooping statistics 
[ | 
{  begin |  exclude | include  } 
regular-expression  ]  Available in any view
 
Clear the statistics information of 
PIM messages learned by PIM 
snooping.  reset pim-snooping statistics 
Available in user view 
 
PIM snooping configuration example 
Network requirements 
As shown in Figure 20 , Source 1 sends multicast data to multicast group 224.1.1.1, and Source 2 sends 
multicast data to multicast group 225.1.1.1. Receiver 1 belongs to multicast group 224.1.1.1, and Receiver 
2 belongs to multicast group 225.1.1.1. Router C and Ro uter D run IGMP on their interface GigabitEthernet 
1/0/1. Router A, Router B, Router C, and Router  D run PIM-SM, and interface GigabitEthernet 1/0/2 on 
Router A acts as a C-BSR and C-RP. 
Configure IGMP snooping and PIM snooping on Switch  A so that Switch A forwards PIM messages and 
multicast data to only the routers that  are interested in the multicast data.  
Figure 20  Network diagram
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Configuration procedure 
1. Assign IP addresses: 
Configure an IP address and subnet ma sk for each interface according to Figure 20. (Details not 
shown.)

 
2.  Configure Router A: 
# Enable IP multicast routing, enable PIM-SM  on each interface, and configure interface 
GigabitEthernet 1/0/2 as a C-BSR and C-RP.  
 system-view 
[RouterA] multicast routing-enable 
[RouterA] interface gigabitethernet 1/0/1 
[RouterA-GigabitEthernet1/0/1] pim sm 
[RouterA-GigabitEthernet1/0/1] quit 
[RouterA] interface gigabitethernet 1/0/2 
[RouterA-GigabitEthernet1/0/2] pim sm 
[RouterA-GigabitEthernet1/0/2] quit 
[RouterA] pim 
[RouterA-pim] c-bsr gigabitethernet 1/0/2 
[RouterA-pim] c-rp gigabitethernet 1/0/2 
3.  Configure Router B: 
# Enable IP multicast routing, and enable PIM-SM on each interface. 
 system-view 
[RouterB] multicast routing-enable 
[RouterB] interface gigabitethernet 1/0/1 
[RouterB-GigabitEthernet1/0/1] pim sm 
[RouterB-GigabitEthernet1/0/1] quit 
[RouterB] interface gigabitethernet 1/0/2 
[RouterB-GigabitEthernet1/0/2] pim sm 
4. Configure Router C: 
# Enable IP multicast routing, enable PIM-SM  on each interface, and enable IGMP on 
GigabitEthernet 1/0/1.  
 system-view 
[RouterC] multicast routing-enable 
[RouterC] interface gigabitethernet 1/0/1 
[RouterC-GigabitEthernet1/0/1] pim sm 
[RouterC-GigabitEthernet1/0/1] igmp enable 
[RouterC-GigabitEthernet1/0/1] quit 
[RouterC] interface gigabitethernet 1/0/2 
[RouterC-GigabitEthernet1/0/2] pim sm 
5.  Configure Router D: 
The configuration on Router D is similar to  that on Router C. (Details not shown.) 
6. Configure Switch A: 
# Enable IGMP snooping globally. 
 system-view 
[SwitchA] igmp-snooping 
[SwitchA-igmp-snooping] quit
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# Create VLAN 100, assign GigabitEthernet 1/0/1 through GigabitEthernet 1/0/4 to this VLAN, 
and enable IGMP snooping and PIM snooping in the VLAN.  
[SwitchA] vlan 100 
[SwitchA-vlan100] port gigabitethernet 1/0/1 to gigabitethernet 1/0/4 
[SwitchA-vlan100] igmp-snooping enable 
[SwitchA-vlan100] pim-snooping enable 
[SwitchA-vlan100] quit 
7. Verify the configuration: 
# On Switch A, display the PIM snooping neighbor information of VLAN 100. 
[SwitchA] display pim-snooping neighbor vlan 100 
  Total number of neighbors: 4 
 
  VLAN ID: 100 
    Total number of neighbors: 4 
    Neighbor        Port                     Expires   Option Flags 
    10.1.1.1        GE1/0/1                   02:02:23  LAN Prune Delay \
    10.1.1.2        GE1/0/2                   03:00:05  LAN Prune Delay \
    10.1.1.3        GE1/0/3                   02:22:13  LAN Prune Delay \
    10.1.1.4        GE1/0/4                   03:07:22  LAN Prune Delay \
The output shows that Router A, Router B, Router C, and Router D are PIM snooping neighbors.  
# On Switch A, display the PIM snooping routing information of VLAN 100.  
[SwitchA] display pim-snooping routing-table vlan 100 slot 1 
  Total 2 entry(ies) 
  FSM Flag: NI-no info, J-join, PP-prune pending 
 
  VLAN ID: 100 
    Total 2 entry(ies) 
    (*, 224.1.1.1) 
      Upstream neighbor: 10.1.1.1 
        Upstream port: GE1/0/1 
        Total number of downstream ports: 1 
          1: GE1/0/3 
             Expires: 00:03:01, FSM: J 
    (*, 225.1.1.1) 
      Upstream neighbor: 10.1.1.1 
        Upstream port: GE1/0/2 
        Total number of downstream ports: 1 
          1: GE1/0/4 
             Expires: 00:01:05, FSM: J 
The output shows that Switch A will forward th e multicast data intended for multicast group 
224.1.1.1 to only Router C, and forward the  multicast data intended for multicast group 
225.1.1.1 to only Router D.
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Troubleshooting PIM snooping 
PIM snooping does not work 
Symptom 
PIM snooping does not work on the switch.  
Analysis 
IGMP snooping or PIM snooping is not enabled on the switch.  
Solution 
1. Use the  display current-configuration  command to check the status of IGMP snooping and PIM 
snooping. 
2.  If IGMP snooping is not enabled, enter system view and use the  igmp-snooping command to 
enable IGMP snooping globally. Then, enter VLAN view and use the  igmp-snooping enable and 
pim-snooping enable  commands to enable IGMP snooping and PIM snooping in the VLAN. 
3. If PIM snooping is not enabled, enter VLAN view and use the  pim-snooping enable command to 
enable PIM snooping in the VLAN.  
Some downstream PIM-capable routers cannot receive 
multicast data 
Symptom 
In a network with fragmented join/prune messages, some downstream PIM-capable routers cannot 
receive multicast data.  
Analysis 
PIM snooping cannot reassemble mess ages, and it cannot maintain the status of downstream routers that 
the join/prune message fragments carry. To ensure the normal operation of the system, PIM snooping 
must broadcast join/prune message fragments in the VLAN. However, if the VLAN has a PIM-capable 
router that has the join suppression function enable d, the broadcast join/prune message fragments might 
suppress the join messages of other PIM-capable ro uters in the VLAN. As a result, some PIM-capable 
routers cannot receive the multicas t data destined for a specific multicast group because their join 
messages are suppressed. To solve this problem, disable the join suppression function on all PIM-capable 
routers that connect to the PIM snoop ing-capable switch in the VLAN.  
Solution 
1. Use the  pim hello-option neighbor-tracking command to enable the neighbor tracking function on 
the interfaces of PIM routers that co nnect to the PIM snooping-capable switch. 
2. If a PIM-capable router cannot be enabled with th e neighbor tracking function, you have to disable 
PIM snooping on the switch.
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Configuring multicast VLANs 
Overview 
In the traditional multicast programs-on-demand mode shown in  Figure 21, w hen hosts (Host A, Host B 
and Host C) that belong to different VLANs requir e multicast programs-on-demand service, the Layer 3 
device, Router A, must forward a separate copy of the multicast traffic in each user VLAN to the Layer 2 
device, Switch A. This results in not only waste of network bandwidth but also extra burden on the Layer 
3 device.  
Figure 21  Multicast transmission without multicast VLAN  
 
 
The multicast VLAN feature configured on the Layer 2 device is the solution to this issue. With the 
multicast VLAN feature, the Layer 3 device replicates the multicast traffic only in the multicast VLAN 
instead of making a separate copy of the multicast traffic in each user VLAN. This saves network 
bandwidth and lessens the burden on the Layer 3 device. 
The multicast VLAN feature can be implemented in sub-VLAN-based multicast VLAN and port-based 
multicast VLAN. 
Sub-VLAN-based multicast VLAN 
As shown in Figure 22, Host A, Host B, and Host C are in different user VL ANs. On Switch A, configure 
VLAN 10 as a multicast VLAN, configure all the user VLANs as sub-VLANs of VLAN 10, and enable 
IGMP snooping in the multicast VLAN.  
Source Receiver
Host A
 Multicast packetsVLAN 2
VLAN 3
VLAN 4
VLAN 2
VLAN 3
VLAN 4
Switch A Receiver
Host B
Receiver Host CRouter A
IGMP querier
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    							 60 
Figure 22 Sub-VLAN-based multicast VLAN 
 
 
After the configuration, IGMP snooping manages router ports in the multicast VLAN and member ports 
in the sub-VLANs. When forwarding multicast data  to Switch A, Router A sends only one copy of 
multicast data to Switch A in the multicast VLAN,  and Switch A distributes the data to the multicast 
VLAN’s sub-VLANs that contain receivers.  
Port-based multicast VLAN 
As shown in  Figure 23, Ho st A, Host B, and Host C are in different user VLANs. All the user ports (ports 
with attached hosts) on Switch A are hybrid ports. On Switch A, configure VLAN 10 as a multicast VLAN, 
assign all the user ports to VLAN 10, and enable IG MP snooping in the multicast VLAN and all the user 
VLANs.  
Figure 23  Port-based multicast VLAN 
 
 
After the configuration, if Switch A receives an IGMP message on a user port, it tags the message with 
the multicast VLAN ID and relays it to the IGMP querier, so that IGMP snooping can uniformly manage 
the router port and member ports in the multicast VLAN. When Router A forwards multicast data to 
Switch A, it sends only one copy of multicast data to Switch A in the multicast VLAN, and Switch A 
distributes the data to all the member ports in the multicast VLAN.  
Source Router A
IGMP querier
VLAN 2
VLAN 3
VLAN 4
Switch A Receiver
Host A
Receiver Host B
Receiver Host C
 Multicast packets
VLAN 2
VLAN 3
VLAN 4
VLAN 10 (Multicast VLAN)
Source
VLAN 2
VLAN 3
VLAN 4
GE1/0/1 GE1/0/2
GE1/0/3
GE1/0/4
Switch A
 Multicast packets
Receiver Host A
Receiver Host B
Receiver Host C
Router A
IGMP querier VLAN 10 (Multicast VLAN)
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    							 61 
For more information about IGMP snooping, router ports, and member ports, see Configuring IGMP 
sn
ooping .  
For more information about VLAN tags, see  Layer 2—LAN Switching Configuration Guide .  
Multicast VLAN configuration task list 
 
Task Remarks 
Configuring a sub-VLAN-based multicast VLAN 
Required 
Use either approach. 
Configuring a port-based 
multicast VLAN Configuring user port attributes 
Configuring multicast VLAN ports  
 
 
NOTE: 
If you have configured both sub-VLAN-based mult icast VLAN and port-based multicast VLAN on a 
device, the port-based multicast VLAN  configuration is given preference.  
 
Configuring a sub-VLAN-based multicast VLAN 
Configuration prerequisites 
Before you configure sub-VLAN-based multicast VLAN, complete the following tasks: 
•  Create VLANs as required. 
•   Enable IGMP snooping in the VLAN to be configured as a multicast VLAN. 
Configuration guidelines 
•  You cannot configure multicast VLAN on a device with IP multicast routing enabled. 
•   The VLAN to be configured as a multicast VLAN must exist.  
•   The VLANs to be configured as sub-VLANs of the multicast VLAN must exist and must not be 
multicast VLANs or sub-VLANs of any other multicast VLAN.  
•   The total number of sub-VLANs of a multicast VLAN must not exceed the maximum number the 
system can support. 
Configuration procedure 
In this approach, you configure a VLAN as a multicast VLAN and configure user VLANs as sub-VLANs 
of the multicast VLAN.  
To configure a sub-VLAN-based multicast VLAN: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified VLAN 
as a multicast VLAN and enter 
multicast VLAN view.  multicast-vlan 
vlan-id   By default, a VLAN is not a 
multicast VLAN.
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Step Command Remarks 
3.  Configure the specified 
VLANs as sub-VLANs of the 
multicast VLAN.  subvlan 
vlan-list  By default, a multicast VLAN has 
no sub-VLANs.  
 
Configuring a port-based multicast VLAN 
When you configure a port-based multicast VLAN, you must configure the attributes of each user port 
and then assign the ports to the multicast VLAN.  
A user port can be configured as a multicast VLAN port 
only if it is an Ethernet port, or Layer 2 aggregate 
interface.  
In Ethernet interface view or Layer 2 aggregate interf ace view, configurations that you make are effective 
on only the current port. In port group view, configurations that you make are effective on all  ports in the 
current port group. 
Configuration prerequisites 
Before you configure a port-based multicast VLAN, complete the following tasks:  
•   Create VLANs as required. 
•   Enable IGMP snooping in the VLAN to be configured as a multicast VLAN. 
•   Enable IGMP snooping in all the user VLANs. 
Configuring user port attributes 
Configure the user ports as hybrid ports that permit packets of the specified user VLAN to pass, and 
configure the user VLAN to which the user ports belong as the default VLAN.  
Configure the user ports to permit packets of the multicast VLAN to pass and untag the packets. Thus, 
after receiving multicast packets tagged with the multicast VLAN ID from the upstream device, the Layer 
2 device untags the multicast packets and forwards them to its downstream device.  
To configure user port attributes: 
 
Step Command Remarks  
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view or port 
group view. 
• Enter interface view or port 
group view: 
interface  interface-type 
interface-number  
• Enter interface view or port 
group view: 
port-group  { manual 
port-group-name  | aggregation 
agg-id  }  Use either command. 
3.
  Configure the user port link 
type as hybrid.  port link-type hybrid 
Access by default
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Step Command Remarks 
4.  Specify the user VLAN that 
comprises the current user 
ports as the default VLAN.  port hybrid pvid vlan
 vlan-id   VLAN 1 by default  
5.  Configure the current user 
ports to permit packets of the 
specified multicast VLANs to 
pass and untag the packets.  port hybrid vlan 
vlan-id-list 
untagged  By default, a hybrid port permits 
only packets of VLAN 1 to pass.  
 
For more information about the 
port link-type, port hybrid pvid vlan , and port hybrid vlan  commands, 
see  Layer 2—LAN Switching Command Reference. 
Configuring multicast VLAN ports 
Configuration guidelines 
In this approach, you configure a VLAN as a multicast VLAN and assign user ports to it. You can do this 
by either adding the user ports in the multicast VLAN or specifying the multicast VLAN on the user ports. 
These two methods provide the same result.  
You cannot configure multicast VLAN on a device with multicast routing enabled.  
The VLAN to be configured as a multicast VLAN must exist.  
A port can belong to only one multicast VLAN.  
Configuration procedure 
To configure multicast VLAN ports in multicast VLAN view:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified VLAN 
as a multicast VLAN and enter 
multicast VLAN view.  multicast-vlan
 vlan-id   By default, a VLAN is not a 
multicast VLAN.
 
3.  Assign ports to the multicast 
VLAN.  port 
interface-list   By default, a multicast VLAN has 
no ports. 
 
 
To configure multicast VLAN ports in interface view or port group view:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified VLAN 
as a multicast VLAN and enter 
multicast VLAN view.  multicast-vlan
 vlan-id   By default, a VLAN is not a 
multicast VLAN. 
3.
  Return to system view. 
quit  N/A
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    							 64 
Step Command Remarks 
4.  Enter interface view or port 
group view. 
• Enter interface view: 
interface  interface-type 
interface-number  
• Enter port group view: 
port-group  manual 
port-group-name   Use either command. 
5.
  Configure the current port as 
a member port of the multicast 
VLAN.  port multicast-vlan 
vlan-id  By default, a user port does not 
belong to any multicast VLAN.  
 
Displaying and maintaining multicast VLAN 
 
Task Command Remarks 
Display information about a 
multicast VLAN.  display multicast-vlan
 [ vlan-id ] [ | 
{  begin |  exclude | include  } 
regular-expression  ]  Available in any view 
 
Multicast VLAN configuration examples 
Sub-VLAN-based multicast VLAN configuration example 
Network requirements 
As shown in 
Figure 24, IGMPv2 runs on Router A, and IGMPv2 snooping runs on Switch A, Switch B, 
and Switch C. Router A acts as the IGMP querier. The multicast source sends multicast data to multicast 
g r o u p  224 .1.1.1.  H o s t  A ,  H o s t  B ,  H o s t  C ,  a n d  H o s t  D  a r e  r e c e i v e r s  o f  t h e  m u l t i c a s t  g r o u p.  T h e  h o s t s  b e l o n g  
to VLAN 2 through VLAN 5 respectively. 
Configure the sub-VLAN-based multicast VLAN feature on Switch A so that Router A just sends multicast 
data to Switch A through the multicast VLAN and Switch  A forwards the traffic to the receivers that belong 
to different user VLANs.
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