02_8_在NBMA环境下的组播

2019年7月27日 02:15 作者：金淼淋分类：Multicast  599

YES LAB
To Run IP Multicast over NBMA Media

Multicast over NBMA
YES LAB
— Non-Broadcastwith Multiple Access (NBMA)
networks— like LAN with no broadcast capability,
e.g. Frame relay, SMDS, ATM, PRI ISDN
— Multicast/broadcast packets on an NBMA
interface have to be replicated for each
destination, accessible via virtual circuits on the
point-to-multipoint interface

Multicast over NBMA (con
YES LAB
— Full mesh of virtual circuits
All routers one hop away from all other routers -
broadcast keyword sufficient
— Partial mesh of virtual circuits
• Remote routers one hop away from the central router
• More hops between remote routers
• Central router: Incoming Interface Outgoing Interface
in some situations — multicast forwarding broken

Multicast over NBMA (con
Full Mesh
NBMA Network
Frame Relay
or ATM
.2
Physical Interface
Virtual Circuit —
YES LAB
Logical IP Subnet
192.1.1.0/24
c

Multicast over NBMA (con
Partial Mesh
NBMA Network
Frame Relay
or ATM
.2
Remote Site
Router
Physical Interface
Virtual Circuit —
YES LAB
- .T A Central Site Router
Logical IP Subnet
192.1.1.0/24
c
Remote Site
Router
D Remote Site Router

How Routers See NBMA at
YES LAB
Central Site
Router
Layer 3 Viewpoint
so .1
192.1.1.0/24
.2
so
.3
.4
.5
Remote Site
Routers

How Routers See NBMA at
YES LAB
Central Site
Router
Layer 3 Viewpoint
192 .i.i.i
.2
so
.3
.1
192.1.1.0/24
.4
.5
Remote Site
Routers

How Routers See NBMA at L3 (c
YES LAB
Central Site
Router
Layer 2 Reality
so .1
so .2
so .3
so .4
192.1.1.0/24
.5
Remote Site
Routers

How Routers See NBMA at L3 (c
YES LAB
Central Site
Router
ip 1'32.1.1.1 cr.
192 .1.1.
trnmr. rrlny map 192.•1.1.
11
tr.-amt: ml ny map IW2.•l.1.4 d lei 1'"
map d lei 13
.2
so .3
.1
so .4
Layer 2 Reality
192.1.1.0/24
.5
Remote Site
Routers

How Routers See
nn:nn:
I int.*' Null,
.2
NBMA at 13 (c
YES LAB
Central Site
Router
Layer 3 Viewpoint
192.1.1.0/24
so
.3
so
.4
.5
Remote Site
Routers

How Routers See
nn:nn:
Null,
.2
NBMA at 13 (c
YES LAB
Central Site
Router
Layer 3 Viewpoint
192.1.1.0/24
in
so
r, G) Join
.3
so
r, G) Join
.5
Remote Site
Routers
Members

How Routers See NBMA at L3 (c
YES LAB
Central Site
Router
Source
so .1
Layer 3 Viewpoint
.2
192.1.1.0/24
.4
.3
Members
.5
Remote Site
Routers

How Routers See NBMA at L3 (c
YES LAB
Central Site
Router
Source
Layer 2 Reality
.1
192.1.1.0/24
• Router has to use
pseudobroadcast
to replicate packets in
Layer 2 code.
.2
.3
Members
so .4
so .5
Remote Site
Routers

PIM DM Problem with
Partial Mesh
Central Site
Router
Source
YES LAB
so .1
Layer 3 Viewpoint
192.1.1.0/24
(S, G) prune
.2
.3
so
.4
.5
Remote Site
Routers
Members

PIM DM Problem with
Partial Mesh (cont.)
Central Site
Router
YES LAB
Source
Not heard by the other
Remote Site Routers!
S, G) Prune
Layer 2 Reality
.1
192.1.1.0/24
• Other routers will
not override the
prune.
.2
so
.3
.4
so
Members
so .5

PIM DM Problem with
Partial Mesh (cont.)
Central Site
Router
Source
YES LAB
so
.3
.4
so
Layer 2 Reality
192.1.1.0/24
so 5
(S, G) traffic is
shutoff !
Members

PIM NBMA Mode
YES LAB
• Avoiding pseudobroadcast by using 'ip pim nbma-mode'.
Central Site Router
.1
ip .1.1
2
.3
so .4
192.1.1.0/24
.5
Remote Site
Routers

PIM NBMA Mode (cont.)
YES LAB
• Avoiding pseudobroadcast by using 'ip pim nbma-mode'.
Central Site Router
so .1
192.1.1.0/24
e. :o.i.i.i,
.2
so .3
Members
so .4
.5
Remote Site
Routers

PIM NBMA Mode (cont.)
YES LAB
• Avoiding pseudobroadcast by using 'ip pim nbma-mode'.
Central Site Router
Source
so .1
192.1.1.0/24
• Router can now
replicate packets in
Layer 3 code.
• Packets only go
where needed.
• Fast switched
.2
.3
Members
so .4
.5
Remote Site
Routers

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组播

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02_8_在NBMA环境下的组播

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