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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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prune timer state of all the routers on the path. A multi-access subnet can have the state-refresh capability 
only if the state-refresh capability is enabled on all IPv6 PIM routers on the subnet. 
To enable the state-refresh capability:  
 
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 state-refresh 
capability.   pim ipv6 state-refresh-capable  Optional. 
Enabled by default.
 
 
Configuring state refresh parameters 
The router directly connected with the multicast source periodically sends state-refresh messages. You can 
configure the interval for sending such messages. 
A router might receive multiple state-refresh messages within a short time. Some messages might be 
duplicated messages. To keep a router from receiv ing such duplicated messages, you can configure the 
time that the router must wait before receiving the next state-refresh message. If the router receives a new 
state-refresh message within the waiting time, it discards it. If this timer times out, the router will accept 
a new state-refresh message, refresh its own IPv6 PIM-DM state, and reset the waiting timer.  
The hop limit value of a state-refresh message decrements  by 1 whenever it passes a router before it is 
forwarded to the downstream node until the hop limit value comes down to 0. In a small network, a 
state-refresh message might cycle in the network.  To control the propagation scope of state-refresh 
messages, you must configure an appropriate hop limit value based on the network size.  
Perform the following configurations on all routers in the IPv6 PIM domain.  
To configure state-refresh parameters: 
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A 
3.  Configure the interval 
between state-refresh 
messages.   state-refresh-interval 
interval  Optional. 
60 seconds by default.
 
4.  Configure the time to wait 
before receiving a new 
state-refresh message.  state-refresh-rate-limit 
interval Optional. 
30 seconds by default.
 
5.  Configure the hop limit value 
of state-refresh messages.  state-refresh-hoplimit 
hoplimit-value
  Optional. 
255 by default.
 
 
Configuring IPv6 PIM-DM graft retry period 
In IPv6 PIM-DM, graft is the only type of message that uses the acknowledgment mechanism. In an IPv6 
PIM-DM domain, if a router does not receive a graf t-ack message from the upstream router within the 
specified time after it sends a graft message, th e router keeps sending new graft messages at a
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configurable interval (namely, graft retry period) until it receives a graft-ack message from the upstream 
router.  
To configure the IPv6 PIM-DM graft retry period:  
 
Step Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Configure the graft retry 
period.   pim ipv6 timer graft-retry 
interval Optional. 
3 seconds by default.
 
 
For more information about the configuration of other timers in IPv6 PIM-DM, see  Configuring IPv6 PIM 
common timer
s . 
Configuring IPv6 PIM-SM 
IPv6 PIM-SM configuration task list  
Task   Remarks 
Enabling IPv6 PIM-SM  Required.
 
Configuring an RP  Configuring a static RP 
Required. 
Use any a

pproach. 
Configuring a C-RP 
Enabling embedded RP 
Configuring C-RP timers globally  Optional.
 
Configuring a BSR  Configuring a C-BSR 
Required. 
Configuring an IPv6 PIM domain border Optional. 
Configuring C-BSR parameters globally Optional. 
Configuring C-BSR timers Optional. 
Disabling BSM semantic fragmentation Optional. 
Configuring IPv6 
administrative scoping Enabling IPv6 administrative scoping 
Optional.
  
Configuring an IPv6 admin-scope zone boundary Optional. 
Configuring C-BSRs for IPv6 admin-scope zones Optional. 
Configuring IPv6 multicast source registration  Optional.
 
Disabling SPT switchover  Optional.
 
Configuring IPv6 PIM common features  Optional.
 
 
Configuration prerequisites 
Before you configure IPv6 PIM-SM, complete the following tasks:
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•  Enable IPv6 forwarding and configure an IPv6 unic ast routing protocol so that all devices in the 
domain are interoperable at the network layer. 
•   Determine the IP address of a static RP and the ACL  rule defining the range of IPv6 multicast groups 
to be served by the static RP. 
•   Determine the C-RP priority and the ACL rule defi ning the range of IPv6 multicast groups to be 
served by each C-RP. 
•   Determine the legal C-RP address range and the ACL rule defining the range of IPv6 multicast 
groups to be served. 
•   Determine the C-RP-Adv interval.  
•   Determine the C-RP timeout. 
•   Determine the C-BSR priority. 
•   Determine the hash mask length. 
•   Determine the IPv6 ACL rule defining a legal BSR address range. 
•   Determine the BS period. 
•   Determine the BS timeout.  
•   Determine the IPv6 ACL rule for register message filtering.  
•   Determine the register suppression time. 
•   Determine the register probe time.  
•   Determine the IPv6 ACL rule and sequencing rule for disabling an SPT switchover.  
Enabling IPv6 PIM-SM 
With IPv6 PIM-SM enabled, a router sends hello mess ages periodically to discover IPv6 PIM neighbors 
and processes messages from the IPv6 PIM neighbors. When you deploy an IPv6 PIM-SM domain, 
enable IPv6 PIM-SM on all non-border interfaces of the routers.  
 
  IMPORTANT: 
All the interfaces of the same device mu
st operate in the same IPv6 PIM mode.  
To enable IPv6 PIM-SM:   
Step Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable IPv6 multicast routing.  
multicast ipv6 routing-enable  Disabled by default.
 
3.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
4.
  Enable IPv6 PIM-SM.  
pim ipv6 sm  Disabled by default.
 
 
For more information about the  multicast ipv6 routing-enable command, see IP Multicast Command 
Reference . 
Configuring an RP 
An RP can be manually configured or dynamically elected through the BSR mechanism. For a large IPv6 
PIM network, static RP configuration is a tedious job. Generally, static RP configuration is just a backup
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method for the dynamic RP election mechanism to enhance the robustness and operation manageability 
of a multicast network. 
 
 IMPORTANT: 
In an IPv6 PIM network, if both IPv6 PIM-SM
 and IPv6 BIDIR-PIM are enabled, do not confi
gure the same
RP to serve IPv6 PIM-SM and IPv6 BIDIR-PIM simultan eously to avoid IPv6 PIM routing table errors.  
 
Configuring a static RP 
If only one dynamic RP exists in a network, manually configuring a static RP can avoid communication 
interruption because of single-point failures. It can also avoid frequent message exchange between C-RPs 
and the BSR.  
 
  IMPORTANT: 
To enable a static RP to work normally, you must perf
orm this configuration on all routers in the IPv6 
PIM-SM domain and specify the same RP address. 
 
Perform the following configuration on all the routers in the IPv6 PIM-SM domain. 
To configure a static RP: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A 
3.  Configure a static RP for IPv6 
PIM-SM.   static-rp
 ipv6-rp-address  
[ acl6-number  ] [ preferred ]  No static RP by default.
 
 
Configuring a C-RP  
In an IPv6 PIM-SM domain, you can configure routers that intend to become the RP as C-RPs. The BSR 
collects the C-RP information by receiving the C-RP-Adv messages from C-RPs or auto-RP announcements 
from other routers and organizes the information into  an RP-set, which is flooded throughout the entire 
network. Then, the other routers in the network calculate the mappings between specific group ranges 
and the corresponding RPs based on the RP-set. HP recommends that you configure C-RPs on backbone 
routers. 
To guard against C-RP spoofing, you need to configure a legal C-RP address range and the range of IPv6 
multicast groups to be served on the BSR. In additi on, because every C-BSR has a chance to become the 
BSR, you need to configure the same filtering poli cy on all C-BSRs in the IPv6 PIM-SM domain.  
When you configure a C-RP, ensure a relatively large bandwidth between this C-RP and the other devices 
in the IPv6 PIM-SM domain.  
An RP can serve multiple IPv6 multicast groups or all IPv6 multicast groups. Only one RP can forward 
IPv6 multicast traffic for an IPv6 multicast group at a moment. 
To configure a C-RP:  
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A
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Step Command  Remarks 
3.  Configure an interface to be a 
C-RP for IPv6 PIM-SM.  c-rp 
ipv6-address  [ {  group-policy  
acl6-number  | scope  scope-id  } | priority  
priority  | holdtime  hold-interval  | 
advertisement-interval  adv-interval ] *   No C-RPs are configured by 
default.
 
4.  Configure a legal C-RP 
address range and the range 
of IPv6 multicast groups to be 
served.   crp-policy 
acl6-number   Optional. 
No restrictions by default.
 
 
Enabling embedded RP 
With the embedded RP feature enabled, the router can resolve the RP address directly from the IPv6 
multicast group address of an IPv6 multicast packets. This RP can replace the statically configured RP or 
the RP dynamically calculated based on the BSR mechan i s m.  Th e re fo re,  t h e  D R  d o e s  n o t  n e e d  t o  i d e n t i f y  
the RP address beforehand.  
Perform this configuration on all routers in the IPv6 PIM-SM domain. 
To enable embedded RP:  
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A 
3.  Enable embedded RP.  
embedded-rp  [ acl6-number  ] 
Optional. 
By default, embedded RP is enabled for IPv6 
multicast groups in the default embedded RP 
address scopes. 
 
 
 NOTE: 
The default embedded RP address scopes are FF7x ::/12 and FFFx::/12. Here x refers to any legal 
address scope. For more information about the Scope field, see  Multicast overview. 
 
Configuring C-RP timers globally 
To enable the BSR to distribute the RP-set information within the IPv6 PIM-SM domain, C-RPs must 
periodically send C-RP-Adv messages to the BSR.  The BSR obtains the RP-set information from the 
received messages, and encapsulates its own IPv6 addr ess together with the RP-set information in its 
bootstrap messages. The BSR then fl oods the bootstrap messages to all IPv6 routers in the network.  
Each C-RP encapsulates a timeout value in its C-RP -Adv messages. After receiving a C-RP-Adv message, 
the BSR obtains this timeout value and starts a C-RP ti meout timer. If the BSR fails to obtain a subsequent 
C-RP-Adv message from the C-RP when the timer times out, the BSR assumes the C-RP to have expired or 
become unreachable.  
You must configure the C-RP timers on C-RP routers. 
To configure C-RP timers globally:  
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A
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Step Command  Remarks 
3.  Configure the C-RP-Adv 
interval.   c-rp
 advertisement-interval  interval Optional. 
60 seconds by default.
 
4.  Configure C-RP timeout time.  
c-rp  holdtime  interval
  Optional. 
150 seconds by default.
 
 
For more information about the configuratio n of other timers in IPv6 PIM-SM, see Configuring IPv6 PIM 
common timer
s .  
Configuring a BSR 
Configuration guidelines 
Before you configure a BSR, make sure that you are familiar with BSR election process, BSR legal address 
against BSR spoofing, IPv6 PIM domain border, glo bal C-BSR parameters, C-BSR timers, and bootstrap 
message fragments (BSMFs). 
•   BSR election process 
A n  I P v 6  P I M - S M  d o m a i n  c a n  h a v e  o n l y  o n e  B S R ,  b u t  m u s t  h a v e  a t  l e a s t  o n e  C - B S R .  A n y  r o u t e r  c a n  
be configured as a C-BSR. Elected from C-BS Rs, the BSR is responsible for collecting and 
advertising RP information in the IPv6 PIM-SM domain.  
You should configure C-BSRs on routers in the backbone network. When you configure a router as 
a C-BSR, be sure to specify the IPv6 address of  an IPv6 PIM-SM-enabled interface on the router. 
The BSR election process is as follows:  
a.  Initially, every C-BSR assumes itself to be the  BSR of this IPv6 PIM-SM domain and uses its 
interface IPv6 address as the BSR addr ess to send bootstrap messages.  
b. When a C-BSR receives the bootstrap message of  another C-BSR, it first compares its own 
priority with the other C-BSR’s priority carried  in the message. The C-BSR with a higher priority 
wins. If a tie exists in the priority, the C-BSR with a higher IPv6 address  wins. The loser uses the 
winner’s BSR address to replace its own BSR addres s and no longer assumes itself to be the 
BSR, and the winner keeps its own BSR address and continues assuming itself to be the BSR.  
•   BSR legal address against BSR spoofing 
Configuring a legal range of BS R addresses enables filtering of bootstrap messages based on the 
address range, thereby preventing a maliciously co nfigured host from masquerading as a BSR. 
You must make the same configuration on all ro uters in the IPv6 PIM-SM domain. Typical BSR 
spoofing cases and the corr esponding preventive measures are as follows:  
{ Some maliciously configured hosts can forge boot strap messages to fool routers and change RP 
mappings. Such attacks often occur on border routers. Because a BSR is inside the network 
whereas hosts are outside the network, you can protect a BSR against attacks from external 
hosts by enabling the border routers to perfor m neighbor checks and RPF checks on bootstrap 
messages and to discard unwanted messages.  
{  If an attacker controls a router in the network or if the network contains an illegal router, the 
attacker can configure this router as a C-BSR an d make it win BSR election to control the right 
of advertising RP information in the network. After you configure a router as a C-BSR, the router 
automatically floods the network with bootstra p messages. Because a bootstrap message has 
a hop limit value of 1, the whole network will not be affected as long as the neighbor router 
discards these bootstrap messages. Therefore, with a legal BSR address range configured on
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    							 361 
all routers in the entire network, all these routers will discard bootstrap messages from out of the 
legal address range.  
These preventive measures can partially protect the  security of BSRs in a network. However, if an 
attacker controls a legal BSR, the problem will still occur. 
Because a large amount of information needs to be exchanged between a BSR and the other 
devices in the IPv6 PIM-SM doma in, a relatively large bandwidth should be provided between the 
C-BSR and the other devices in the IPv6 PIM-SM domain. 
•   IPv6 PIM domain border 
As the administrative core of an IPv6 PIM-SM  domain, the BSR sends the collected RP-set 
information in the form of bootstrap messages to all routers in the IPv6 PIM-SM domain. 
An IPv6 PIM domain border is a bootstrap messa ge boundary. Each BSR has its specific service 
scope. IPv6 PIM domain border interfaces partition  a network into different IPv6 PIM-SM domains. 
Bootstrap messages cannot cross a doma in border in either direction.  
•   C-BSR parameters 
In each IPv6 PIM-SM domain, a unique BSR is elected from C-BSRs. The C-RPs in the IPv6 PIM-SM 
domain send advertisement messages to the  BSR. The BSR summarizes the advertisement 
messages to form an RP-set and advertises it to  all routers in the IPv6 PIM-SM domain. All the 
routers use the same hash algorithm to get the  RP address that corresponds to specific IPv6 
multicast groups.  
•   C-BSR timers 
The BSR election winner multicasts its own IPv6  address and RP-Set information throughout the 
region that it serves through bootstrap messag es. The BSR floods bootstrap messages throughout 
the network at the interval of the BS (BSR stat e) period. Any C-BSR that receives a bootstrap 
message retains the RP-set for the length of BS time out, during which no BSR election occurs. If no 
bootstrap message is received from the BSR be fore the BS timeout timer expires, a new BSR 
election process begins among the C-BSRs.  
About the BS period:  
{  By default, the BS period is determined by the formula BS period = (BS timeout – 10) / 2. The 
default BS timeout is 130 seconds, so the default BS period = (130 – 10) / 2 = 60 (seconds).  
{ If this parameter is manually configured, the system will use the configured value.  
About the BS timeout timer:  
{  By default, the BS timeout value is determined by the formula BS timeout timer = BS period × 
2 + 10. The default BS period is 60 seconds, so the default BS timeout timer = 60 × 2 + 10 
= 130 (seconds). 
{ If this parameter is manually configured, the system will use the configured value.  
In the configuration, make sure that the BS pe riod is smaller than the BS timeout value.  
•   Bootstrap message fragments (BSMFs) 
Generally, a BSR periodically distributes the RP-s et information in bootstrap messages within the 
IPv6 PIM-SM domain. It encapsulates a BSM in  an IPv6 datagram and might split the datagram 
into fragments if the message exceeds the maximum tr ansmission unit (MTU). In respect of such IP 
fragmentation, loss of a single IP fragment le ads to unavailability of the entire message.  
Semantic fragmentation of BSMs can solve this issu e. When a BSM exceeds the MTU, it is split to 
multiple bootstrap message fragments (BSMFs).  
{  After receiving a BSMF that contains the RP-set information of one group range, a non-BSR 
router updates corresponding RP -set information directly.
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{ If the RP-set information of one group range is carried in multiple BSMFs, a non-BSR router 
updates corresponding RP-set information after receiving all these BSMFs.  
Because the RP-set information contained in each segment is different, loss of some IP fragments 
will not result in dropping  of the entire message.  
The function of BSM semantic fragmentation is en abled by default. Devices not supporting this 
function might deem a fragment as an entire mess age and learn only part of the RP-set information. 
Therefore, if such devices exist in the IPv6 PIM-SM domain, you need to disable the semantic 
fragmentation function on the C-BSRs.  
Generally, a BSR performs BSM semantic fragmentat ion according to the MTU of its BSR interface. 
However, the semantic fragmentation of BSMs orig inated because of learning of a new IPv6 PIM 
neighbor is performed according to  the MTU of the outgoing interface.  
Configuring a C-BSR 
 
Step Command  Remarks 
1.  Enter system view. 
system-view N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A 
3.  Configure an interface as a 
C-BSR.   c-bsr
 ipv6-address  
[ hash-length  [ priority  ] ]  No C-BSRs are configured by default.
 
4.  Configure a legal BSR 
address range.   bsr-policy
 acl6-number  Optional. 
No restrictions by default.
 
 
Configuring an IPv6 PIM domain border 
Perform the following configuration on routers that you want to configure as an IPv6 PIM domain border. 
To configure an IPv6 PIM border domain:  
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Configure an IPv6 PIM 
domain border.   pim ipv6 bsr-boundary  No IPv6 PIM domain border is 
configured by default.
 
 
Configuring C-BSR parameters globally 
Perform the following configuration on C-BSR routers.  
To configure C-BSR parameters globally:  
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6  N/A 
3.  Configure the hash mask 
length.   c-bsr hash-length 
hash-length Optional. 
126 by default.
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Step Command  Remarks 
4.  Configure the C-BSR priority.  
c-bsr priority  priority  Optional. 
64 by default. 
 
 
Configuring C-BSR timers 
Perform the following configuration on C-BSR routers. 
To  c o n fig u re  C - BS R  t i me rs : 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view. 
pim ipv6  N/A 
3.
  Configure the BS 
period.  c-bsr interval interval
 Optional. 
For the default value, see the note after this table.
 
4.
  Configure the BS 
timeout timer.  c-bsr holdtime interval
 Optional. 
For the default value, see the note after this table.
 
 
Disabling BSM semantic fragmentation  
To disable the BSM semantic fragmentation function:  
Step Command Remarks 
1.
  Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view. 
pim ipv6  N/A 
3.  Disable the BSM semantic 
fragmentation function.  undo bsm-fragment
 enable   By default, the BSM semantic 
fragmentation function is enabled. 
 
 
Configuring IPv6 administrative scoping 
With IPv6 administrative scoping disabled, an IP
v6 PIM-SM domain has only one BSR. The BSR 
manages the whole network. To manage your network more effectively and specifically, you can 
partition the IPv6 PIM-SM domain into multiple IP v6 admin-scope zones. Each IPv6 admin-scope zone 
maintains a BSR, which serves a specific IPv6 multicast group range. The IPv6 global scope zone also 
maintains a BSR, which serves the IPv6 multicast groups with the Scope field in the group addresses 
being 14.  
Enabling IPv6 administrative scoping 
Before you configure an IPv6 admin-scope zone, you must enable IPv6 administrative scoping.   
Perform the following configuration on all routers in the IPv6 PIM-SM domain.   
To enable IPv6 administrative scoping: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.
  Enter IPv6 PIM view.  
pim ipv6  N/A
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Step Command Remarks 
3.  Enable IPv6 administrative 
scoping.   c-bsr admin-scope 
Disabled by default 
 
Configuring an IPv6 admin-scope zone boundary 
The boundary of each IPv6 admin-scope zone is fo rmed by ZBRs. Each admin-scope zone maintains a 
BSR, which serves multicast groups with a specific Scope field in their group addresses. Multicast 
protocol packets (such as assert messages and bootstrap messages) that belong to this range cannot 
cross the admin-scope zone boundary.   
Perform the following configuration on routers that you want to configure as a ZBR.   
To configure an IPv6 admin-scope zone boundary: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter interface view.  
interface  interface-type interface-number  N/A 
3.  Configure an IPv6 
multicast forwarding 
boundary.   multicast ipv6 boundary 
{
 ipv6-group-address prefix-length  | scope  
{  scope-id  | admin-local  | global  | 
organization-local  | site-local  } }  By default, no multicast forwarding 
boundary is configured. 
 
 
For more information about the  multicast ipv6 boundary command, see IP Multicast Command 
Reference .  
Configuring C-BSRs for IPv6 admin-scope zones 
In a network with IPv6 administrative scoping enabled,  BSRs are elected from C-BSRs specific to different 
Scope field values. The C-RPs in the network send advertisement messages to the specific BSR. The BSR 
summarizes the advertisement messages to form an RP-set  and advertises it to all routers in the specific 
admin-scope zone. All the routers use the same hash  algorithm to get the RP address corresponding to 
the specific IPv6 multicast group.  
You can configure the hash mask length and C-BSR priority globally and in an IPv6 admin-scope zone.  
•   The values configured in the IPv6 admin-scope zo ne have preference over the global values.  
•   If you do not configure these parameters in the IPv6 admin-scope zone, the corresponding global 
values will be used.  
For configuration of global C-BSR parameters, see  Configuring C-BSR parameters globally. 
P

erform the following configuration on the routers that you want to configure as C-BSRs in IPv6 
admin-scope zones.   
To configure a C-BSR for an IPv6 admin-scope zone: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter IPv6 PIM view.  
pim ipv6   N/A 
3.  Configure a C-BSR for an 
IPv6 admin-scope zone.  c-bsr
 scope  { scope-id  | admin-local  | 
global  | organization-local  | site-local } 
[ hash-length  hash-length  | priority 
priority  ] *  No C-BSRs are configured for an 
IPv6 admin-scope zone by default.
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