7750 SR高级配置指南_1701706365.4593518说明书-USB迷|专注于互联网分享

2024年9月16日发(作者：腾绿蝶)

ESM IPv4: Multicast in a Wholesale/Retail

Scenario

In This Chapter

This section describes ESM IPv4 multicast configurations in a wholesale/retail scenario.

Topics in this section include:

•

Applicability on page 2126

Overview on page 2127

Configuration on page 2129

Conclusion on page 2140

7750 SR Advanced Configuration GuidePage 2125

Applicability

Page 2126

This configuration example is applicable to the 7750 SR-7/12/12e with IOM3-XP and IMMs, the

7450 ESS -7/12 chassis in mixed mode with IOM3-XP and IMMs, and also to the 7750 SR-c4/12

platforms, and requires chassis mode C as a minimum. Note that the 7450 will only operate as an

L2TP Access Concentrator (LAC) for L2TP services.

The configuration was tested on release 11.0.R1 and covers both IPoE and PPPoE subscribers.

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

Overview

Alcatel-Lucent’s Triple Play Service Delivery Architecture (TPSDA) allows operators to integrate

High Speed Internet (HSI), voice and video services within a single network infrastructure. The

goal of this configuration example is to provide a walk through of a wholesale/retail multicast

setup.

There are two wholesale/retail models in TPSDA. In the first model, the retail service is co-located

with the wholesale service whereas in the second model, for PPP services only, the retail service is

on a separate BNG. The network topology shown in Figure334 is the first model. It consists of

two 7750s; BNG-1 is a wholesaler Broadband Network Gateway (BNG) with the retail service co-

located and the second is a retailer router. Figure335 shows the second model where the retail

service is a separate router and the connection between the wholesale and retail utilizes L2TP. The

7450 in both cases is used as an aggregation switch to aggregate all subscribers.

Aggregation

Switch

Wholesale

BNG

Retail

Router

Multicast

Source

Wholesale

VPRN

Retail

VPRN

7450

IGMP

IPoE/PPPoE Session

7750 SR

Subscribers

al_0549

Figure 334: Wholesale/Retail Model 1

Aggregation

Switch

Wholesale

BNG

Retail

BNG

Retail

VPRN

Multicast

Source

Wholesale

VPRN

L2TP

7450

IGMP

PPPoE Session

7750 SR

Subscribers

al_0550

Figure 335: Wholesale/Retail Model 2

7750 SR Advanced Configuration GuidePage 2127

Overview

Page 2128

The second 7750 is connected directly to the multicast source. On the access side, the BNG is

connected to an aggregation switch aggregating both PPPoE and IPoE subscribers.

There are two basic requirements for a subscriber to receive multicast streams. First, the group

interface for the subscribers must have IGMP enabled. Second, the Enhanced Subscriber

Management (ESM) subscriber must be allowed to receive multicast streams by having IGMP

enabled. When both requirements are met, the BNG will process the subscribers’ IGMP messages,

otherwise, IGMP messages are dropped. All customer premise device (CPE) originated IGMP

messages are aggregated via the 7450 and passed onto the wholesale BNG. It is always the retail

VPRN that processes the IGMP messages. The wholesale VPRN SAPs performs the forwarding

of the actual multicast streams.

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

Configuration

Note that a basic knowledge of multicast and ESM is assumed.

ESM Wholesale-Retail Multicast

There are various ways to provide wholesale and retail multicast function.

•

For the IPoE and PPPoE Layer 3 wholesale/retail model, the wholesale and the retail

services reside on separate VPRNs.

For the PPPoE Layer 2 wholesale/retail model, L2TP is used.

ESM Layer 3 Wholesale-Retail Multicast

Figure336 depicts a Layer 3 wholesale/retail scenario for both IPoE and PPPoE. The first BNG

contains both the wholesale and retail configuration. There are two options for the retail BNG to

deliver the multicast streams to the wholesale BNG:

between the BNGs

using a routed interface between the BNGs, multicast routing is required.

This example will use the second option for delivery of the multicast streams in order to keep the

configuration simple.

Wholesale

BNG-1

VPRN

Retail

group 239.255.1.1

SRC 192.168.4.2

BNG-2

VPRN

1/1/5:1

VPRN

Host Session

IGMP

al_0551

Figure 336: Layer 3 Wholesale/Retail

7750 SR Advanced Configuration GuidePage 2129

ESM Layer 3 Wholesale-Retail Multicast

Page 2130

Step 1.

Below is a configuration extract from the wholesale service on BNG-1 with the group

interface added to IGMP. This configuration applies to both IPoE and PPPoE.

*A:BNG-1> config>service>vprn>sub-if# info

----------------------------------------------

unnumbered “system”

group-interface "wholesale-sub-int-1" create

dhcp

client-applications dhcp ppp

no shutdown

exit

authentication-policy "auth-policy-1"

sap 1/1/5:1 create

sub-sla-mgmt

def-sub-id use-sap-id

def-sub-profile "multicast-profile-1"

def-sla-profile "sla-profile-1"

sub-ident-policy "sub-ident-policy-1"

multi-sub-sap 10

no shutdown

exit

pppoe

session-limit 10

sap-session-limit 10

no shutdown

exit

igmp

group-interface "wholesale-group-int-1"

no shutdown

exit

no shutdown

exit

Step 2.

Also on BNG-1, a separate VPRN is configured for the retailer. The retail configuration

is a little different from the wholesale configuration. Below is a configuration extract from

the retail VPRN with IGMP enabled. This configuration is applicable to both IPoE and

PPPoE. The multicast streams received in the retail VPRN are forwarded to the wholesale

VPRN. Other retail VPRNs can offer multicast streams as well, and the same multicast

addresses can be re-used as long as the address is assigned to a different retail VPRN.

*A:BNG-1> config>service>vprn# info

----------------------------------------------

route-distinguisher 65536:2

subscriber-interface "retail-sub-int-1" fwd-service 1

fwd-subscriber-interface "wholesale-sub-int-1" create

address 10.255.255.254/8

dhcp

server 192.168.0.1

client-applications dhcp ppp

gi-address 10.255.255.254

lease-populate 10

no shutdown

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

exit

igmp

group-interface fwd-service 1 "wholesale-group-int-1

no shutdown

exit

ospf 192.168.2.2

area 0.0.0.0

interface "system"

no shutdown

exit

interface "retail-sub-int-1"

no shutdown

exit

interface "int-BNG-1-BNG-2"

no shutdown

exit

pim

interface "int-BNG-1-BNG-2"

exit

Step 3.

Per host replication is mandatory in a wholesale/retail scenario. A single wholesale SAP

might be shared among different retailers. A wholesale host that has requested a multicast

group will always have the multicast delivered directly. Other hosts on the SAPs might

belong to a different retailer and therefore 1) retailers might not have the same multicast

group and sources and 2) their bandwidth should not be impacted by other hosts’

multicast. Per-host replication is configured in the igmp-policy igmp-policy-1. This is

mandatory for both IPoE and PPPoE subscribers.

*A:BNG 1> config>subscr-mgmt>igmp-policy# info

----------------------------------------------

per-host-replication

Step 4.

The interfaces are added to OSPF and to PIM on the retail BNG that is connected to the

multicast source.

*A:BNG-2> config>service>vprn# info

----------------------------------------------

ospf

area 0.0.0.0

interface "system"

no shutdown

exit

interface "int-BNG-2-BNG-1"

no shutdown

exit

interface “int-multicast-source”

no shutdown

exit

7750 SR Advanced Configuration GuidePage 2131

ESM Layer 3 Wholesale-Retail Multicast

Page 2132

pim

interface "int-BNG-2-BNG-1"

exit

interface "int-multicast-source"

exit

static

address 192.168.4.1

group-prefix 224.0.0.0/4

exit

With the above the configuration, the wholesale/retail setup is ready to process IGMP messages.

Now send an IGMPv3 request to the wholesale SAP. The (S,G) is (192.168.4.2, 239.255.1.1) and

the subscriber IP address is 10.0.0.2. The output below shows that the (S,G) is not registered in the

wholesale VPRN but is in the retail VPRN.

*A:BNG-1> show router 1 igmp group

===============================================================================

IGMP Interface Groups

===============================================================================

IGMP Host Groups

===============================================================================

IGMP SAP Groups

===============================================================================

No Matching Entries

===============================================================================

*A:BNG-1> show router 2 igmp group

===============================================================================

IGMP Interface Groups

===============================================================================

IGMP Host Groups

===============================================================================

(192.168.4.2,239.255.1.1)

Fwd List : 10.0.0.2 Up Time : 0d 00:13:01

===============================================================================

IGMP SAP Groups

===============================================================================

-------------------------------------------------------------------------------

(*,G)/(S,G) Entries : 1

===============================================================================

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

To view all subscribers’ (S,G) pairs, use the following command.

*A:BNG-1> show service active-subscribers igmp detail

===============================================================================

Active Subscribers Detail

===============================================================================

Subscriber IGMP-Policy

HostAddr GrpItf NumGroups

GrpAddr Type Up-Time Mode

SrcAddr Type Blk/Fwd

-------------------------------------------------------------------------------

video_user_01 igmp-policy-1

10.0.0.2 whole-sale 1

239.255.1.1 Dynamic 0d 01:37:55 Include

192.168.4.2 Dynamic Fwd

-------------------------------------------------------------------------------

Number of Subscribers : 1

===============================================================================

Only the retail VPRN is responsible for processing the IGMP messages. Therefore to troubleshoot

a wholesale/retail setup, debug is only relevant on the retail router instance.

debug

router "2"

igmp

group-interface fwd-service "1" "whole-sale"

host "10.0.0.2"

packet mode egr-ingr-and-dropped

exit

7648 2013/05/24 16:59:41.02 EST MINOR: DEBUG #2001 vprn2 IGMP[14]

"IGMP[14]: RX-PKT

[013 07:56:53.680] IGMP host 10.0.0.2 V3 PDU: 10.0.0.2 -> 224.0.0.22 pduLen

Type: V3 REPORT maxrespCode 0x0 checkSum 0xddf6

Num Group Records: 1

Group Record 0

Type: ALW_NEW_SRCS, AuxDataLen 0, Num Sources 1

Mcast Addr: 239.255.1.1

Source Address List

192.168.4.2

7649 2013/05/24 16:59:41.02 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpIfGroupAdd

Adding 239.255.1.1 to IGMP host 10.0.0.2 database"

7650 2013/05/24 16:59:41.02 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpProcessGroupRec

Process group rec ALW_NEW_SRCS received on host 10.0.0.2 for group 239.255.1.1 i

n mode INCLUDE. Num srcs 1"

7750 SR Advanced Configuration GuidePage 2133

ESM Layer 3 Wholesale-Retail Multicast

Page 2134

7651 2013/05/24 16:59:41.02 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpIfSrcAdd

Adding i/f source entry for host 10.0.0.2 (192.168.4.2,239.255.1.1) to IGMP fwdList

Database, redir if N/A"

The same debug command can be used for troubleshooting IGMP leave messages as shown

below.

7652 2013/05/24 16:59:43.90 EST MINOR: DEBUG #2001 vprn2 IGMP[14]

"IGMP[14]: RX-PKT

[013 07:56:56.560] IGMP host 10.0.0.2 V3 PDU: 10.0.0.2 -> 224.0.0.22 pduLen

Type: V3 REPORT maxrespCode 0x0 checkSum 0xdcf6

Num Group Records: 1

Group Record 0

Type: BLK_OLD_SRCS, AuxDataLen 0, Num Sources 1

Mcast Addr: 239.255.1.1

Source Address List

192.168.4.2

7653 2013/05/24 16:59:43.90 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpProcessGroupRec

Process group rec BLK_OLD_SRCS received on host 10.0.0.2 for group 239.255.1.1 i

n mode INCLUDE. Num srcs 1"

7654 2013/05/24 16:59:43.90 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpProcessIfSrcTimerExp

Source Timer expired for IGMP host 10.0.0.2 (192.168.4.2,239.255.1.1)"

7655 2013/05/24 16:59:43.90 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpIfSrcDel

Deleting i/f source entry for host 10.0.0.2 (192.168.4.2,239.255.1.1) from IGMP Dat

abase. DeleteFromAvl: 1 !Redir 0"

7656 2013/05/24 16:59:43.90 EST MINOR: DEBUG #2001 vprn2 IGMP[vprn2 inst 1

"IGMP[vprn2 inst 14]: igmpIfGroupDel

Deleting 239.255.1.1 from IGMP host 10.0.0.2 database"

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

ESM L2TP Wholesale/Retail Multicast

As previously mentioned, the other option for PPPoE wholesale/retail is to use an L2TP

connection as shown in Figure337. LAC-1 contains the wholesale configuration while LNS-1

contains the retail configuration.

Wholesale

Service

LAC-1

VPRN

group 239.255.1.1

SRC 192.168.4.2

LNS-1

VPRN

1/1/11:222

L2TP

Retail

Service

PPP Session

IGMP

al_0552

Figure 337: L2TP Wholesale-Retail Multicast

Below is a configuration extract for the wholesale L2TP Access Concentrator (LAC) in the

wholesale service. It is using the local database, under the pppoe user-db configuration, to

authenticate the subscriber. The wholesale LAC does not process any IGMP messages so it passes

all messages to the retailer LNS.

*A:LAC-1> config>service>vprn>sub-if# info

----------------------------------------------

description "L2TP"

unnumbered “system”

group-interface "LAC-sub-int-1" create

sap 1/1/11:222 create

sub-sla-mgmt

def-sub-id use-sap-id

def-sub-profile "multicast-profile-1

def-sla-profile "sla-profile-1"

sub-ident-policy "sub-ident-policy-1"

multi-sub-sap 10

no shutdown

exit

pppoe

session-limit 10

sap-session-limit 10

user-db "ppp-db-1"

no shutdown

exit

l2tp

group "l2tp-group-1" create

7750 SR Advanced Configuration GuidePage 2135

ESM L2TP Wholesale/Retail Multicast

tunnel "tunnel-1" create

auto-establish

local-name "LAC"

peer 192.0.2.3

no shutdown

Page 2136

exit

no shutdown

exit

no shutdown

The retailer BNG serves as the L2TP Network Server (LNS). Below is a configuration extract for

the LNS. IGMP must be enabled on the ESM group-interface in the retail service.

*A:LNS-1> config>service>vprn>sub-if# info

----------------------------------------------

address 10.255.255.254/8

group-interface "LNS-group-int-1" lns create

sap-parameters

sub-sla-mgmt

def-sub-id use-sap-id

def-sub-profile "multicast-profile-1

def-sla-profile "sla-profile-1"

sub-ident-policy "sub-ident-policy-1"

multi-sub-sap 10

no shutdown

exit

dhcp

server 192.168.0.1

client-applications ppp

gi-address 10.255.255.254

lease-populate 10

no shutdown

exit

l2tp

group "l2tp-group-1" create

tunnel "tunnel-1" create

lns-group 1

ppp

authentication-policy "auth-policy-1"

default-group-interface "LNS-group-int-1" service-id 1

mtu 1500

proxy-authentication always

proxy-lcp always

exit

remote-name "LAC"

no shutdown

exit

no shutdown

exit

no shutdown

igmp

group-interface "LNS-group-int-1"

no shutdown

exit

no shutdown

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

With the above configuration applied, the wholesale/retail multicast setup can be verified. Firstly,

send an IGMP message from the subscriber, the example below uses IGMPv3. The (S,G) sent is

(192.168.4.2, 239.255.1.1) from the subscriber with IP address 10.0.0.2. The show commands

below can be used to verify the multicast group being sent to the subscriber.

*A:LNS-1> show service active-subscribers igmp detail

===============================================================================

Active Subscribers Detail

===============================================================================

Subscriber IGMP-Policy

HostAddr GrpItf NumGroups

GrpAddr Type Up-Time Mode

SrcAddr Type Blk/Fwd

-------------------------------------------------------------------------------

LNS1-pppoe-sub-01 igmp-policy-1

10.0.0.2 LNS 1

239.255.1.1 Dynamic 0d 00:04:41 Include

192.168.4.2 Dynamic Fwd

-------------------------------------------------------------------------------

Number of Subscribers : 1

===============================================================================

The IGMP group is not seen in the wholesale router instance (as shown by the first output below

on LAC-1), however, it is seen in the retail router instance (as shown by the second output below

on LNS-1).

*A:LAC-1> show router 1 igmp group

===============================================================================

IGMP Interface Groups

===============================================================================

IGMP Host Groups

===============================================================================

IGMP SAP Groups

===============================================================================

No Matching Entries

===============================================================================

*A:LNS-1> show router 1 igmp group

===============================================================================

IGMP Interface Groups

===============================================================================

IGMP Host Groups

===============================================================================

(192.168.4.2,239.255.1.1)

Fwd List : 10.0.0.2 Up Time : 0d 00:08:27

===============================================================================

IGMP SAP Groups

===============================================================================

-------------------------------------------------------------------------------

7750 SR Advanced Configuration GuidePage 2137

ESM L2TP Wholesale/Retail Multicast

Page 2138

(*,G)/(S,G) Entries : 1

===============================================================================

Only the retail BNG (LNS-1) is responsible for processing the IGMP messages. Therefore to

troubleshoot ESM multicast for an L2TP service, the following debug commands are used on the

LNS.

debug

router "1"

igmp

group-interface "LNS-01"

host "10.0.0.2"

packet mode egr-ingr-and-dropped

exit

7604 2013/05/24 16:55:49.46 EST MINOR: DEBUG #2001 vprn1 IGMP[8]

"IGMP[8]: RX-PKT

[013 07:53:02.120] IGMP host 10.0.0.2 V3 PDU: 10.0.0.2 -> 224.0.0.22

pduLen 20

Type: V3 REPORT maxrespCode 0x0 checkSum 0xddf6

Num Group Records: 1

Group Record 0

Type: ALW_NEW_SRCS, AuxDataLen 0, Num Sources 1

Mcast Addr: 239.255.1.1

Source Address List

192.168.4.2

7605 2013/05/24 16:55:49.46 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpIfGroupAdd

Adding 239.255.1.1 to IGMP host 10.0.0.2 database"

7606 2013/05/24 16:55:49.46 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpProcessGroupRec

Process group rec ALW_NEW_SRCS received on host 10.0.0.2 for group 239.255.1.1 in mode

INCLUDE. Num srcs 1"

7607 2013/05/24 16:55:49.46 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpIfSrcAdd

Adding i/f source entry for host 10.0.0.2 (192.168.4.2,239.255.1.1) to IGMP fwd

List Database, redir if N/A"

The IGMP leave messages can also be seen in the debug, as shown below.

7615 2013/05/24 16:58:06.38 EST MINOR: DEBUG #2001 vprn1 IGMP[8]

"IGMP[8]: RX-PKT

[013 07:55:19.040] IGMP host 10.0.0.2 V3 PDU: 10.0.0.2 -> 224.0.0.22

pduLen 20

7750 SR Advanced Configuration Guide

ESM IPv4: Multicast in a Wholesale/Retail Scenario

Type: V3 REPORT maxrespCode 0x0 checkSum 0xdcf6

Num Group Records: 1

Group Record 0

Type: BLK_OLD_SRCS, AuxDataLen 0, Num Sources 1

Mcast Addr: 239.255.1.1

Source Address List

192.168.4.2

7616 2013/05/24 16:58:06.38 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpProcessGroupRec

Process group rec BLK_OLD_SRCS received on host 10.0.0.2 for group 239.255.1.1 in mode

INCLUDE. Num srcs 1"

7617 2013/05/24 16:58:06.38 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpProcessIfSrcTimerExp

Source Timer expired for IGMP host 10.0.0.2 (192.168.4.2,239.255.1.1)"

7618 2013/05/24 16:58:06.38 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpIfSrcDel

Deleting i/f source entry for host 10.0.0.2 (192.168.4.2,239.255.1.1) from IGMP

Database. DeleteFromAvl: 1 !Redir 0"

7619 2013/05/24 16:58:06.38 EST MINOR: DEBUG #2001 vprn1 IGMP[vprn1 inst 8

]

"IGMP[vprn1 inst 8]: igmpIfGroupDel

Deleting 239.255.1.1 from IGMP host 10.0.0.2 database"

7750 SR Advanced Configuration GuidePage 2139

Conclusion

Page 2140

Multicast is an essential part of Triple Play Services. The SR/ESS TPSDA solution offering is

much more than a baseline multicast delivery, it includes individual subscriber awareness and

provides each retailer a separate routing context to manage their own multicast content. Subscriber

awareness allows for the fine tuning of each subscriber multicast experience and also for

troubleshooting on a per subscriber basis. This example provides a complete configuration walk

through for multicast delivery for both IPoE and PPPoE in a wholesale/retail model.