Nortel 8630gbr 规格指南
3
how VPNs are implemented can be
captured and brought to market quickly,
and at minimal cost.
captured and brought to market quickly,
and at minimal cost.
Service topologies supported include
point-to-point, point-to-multipoint and
any-to-any models. Implementation of
these specific topologies gives service
providers and enterprises additional flex-
ibility while improving overall resource
utilization and network efficiency. For
example, an enterprise customer with a
headquarters site and many branch
offices would benefit from an Ethernet
VPN service implemented in a point-to-
multipoint or hub-and-spoke fashion.
Leveraging a point-to-multipoint service
topology, service providers can restrict
the spokes to only communicate through
the hub, thereby maximizing the effi-
ciencies of their Ethernet infrastructure
and optimizing resource utilization and
enhancing data security.
point-to-point, point-to-multipoint and
any-to-any models. Implementation of
these specific topologies gives service
providers and enterprises additional flex-
ibility while improving overall resource
utilization and network efficiency. For
example, an enterprise customer with a
headquarters site and many branch
offices would benefit from an Ethernet
VPN service implemented in a point-to-
multipoint or hub-and-spoke fashion.
Leveraging a point-to-multipoint service
topology, service providers can restrict
the spokes to only communicate through
the hub, thereby maximizing the effi-
ciencies of their Ethernet infrastructure
and optimizing resource utilization and
enhancing data security.
Metro Ethernet supported access
deployment models are:
deployment models are:
• Single enterprise service access via a
dedicated link
• Multiple enterprise service access via a
pre-standard IEEE 802.1ad Ethernet
access link
access link
• Multiple enterprise service access via
an Ethernet Services Unit access ring
This flexibility makes it appropriate for
both greenfield build-outs as well as
demand-based expansions to existing
infrastructures. These same capabilities
limit the number of truck-rolls required
to add users and adjust service levels
across the network.
both greenfield build-outs as well as
demand-based expansions to existing
infrastructures. These same capabilities
limit the number of truck-rolls required
to add users and adjust service levels
across the network.
Scalability and efficiency
The primary responsibility of the
Ethernet UNI is service demarcation, yet
the Nortel Ethernet UNI goes beyond
simple demarcation by allowing service
providers and enterprises to deliver
multiple services and service types per
Ethernet UNI is service demarcation, yet
the Nortel Ethernet UNI goes beyond
simple demarcation by allowing service
providers and enterprises to deliver
multiple services and service types per
port. The UNI encapsulates customer
data and adds a unique service label so
service providers no longer need to
worry about overlapping VLAN-IDs,
significantly simplifying operations. The
Metro Ethernet Routing Switch 8600
maps customer VLAN IDs to IEEE
802.1ah service identifiers. A trans-
parent UNI is defined when all traffic
on a physical port is assigned to a single
service ID, while a mapped UNI provides
multiple services per physical port to one
or more customers. This can be accom-
plished across thousands of service and
customer instances as shown in Table 2.
data and adds a unique service label so
service providers no longer need to
worry about overlapping VLAN-IDs,
significantly simplifying operations. The
Metro Ethernet Routing Switch 8600
maps customer VLAN IDs to IEEE
802.1ah service identifiers. A trans-
parent UNI is defined when all traffic
on a physical port is assigned to a single
service ID, while a mapped UNI provides
multiple services per physical port to one
or more customers. This can be accom-
plished across thousands of service and
customer instances as shown in Table 2.
The Metro Ethernet Routing Switch
8600, when performing the role of a
Provider Backbone Bridge, aggregating
Provider Bridge traffic that is Q-in-Q
tagged, can use either the outer (provider)
Q-tag or the combination of inner
(customer) and outer (provider) Q-tags
for service assignment and classification.
This capability gives the service provider
superior flexibility for interworking with
a wide variety of access devices to support
the desired service definitions.
8600, when performing the role of a
Provider Backbone Bridge, aggregating
Provider Bridge traffic that is Q-in-Q
tagged, can use either the outer (provider)
Q-tag or the combination of inner
(customer) and outer (provider) Q-tags
for service assignment and classification.
This capability gives the service provider
superior flexibility for interworking with
a wide variety of access devices to support
the desired service definitions.
The Metro Ethernet Routing Switch
8600 improves bandwidth efficiency by
encapsulating enterprise broadcast traffic
inside provider unicast packets. Addi-
tionally, the 802.1ah Provider Backbone
Bridge implementation uses the MAC
addresses of the Ethernet UNIs (ingress
ports), rather than customer MACs in
the switch forwarding tables. This elimi-
nates the “MAC address explosion” issue
by greatly reducing the number of MAC
addresses that must be learned and
maintained by switches in the service
provider’s core infrastructure. Keeping
the number of MAC addresses to a
minimum reduces the aging out and
relearning of MAC addresses, thus
enhancing end-to-end performance and
making network forwarding far more
stable.
8600 improves bandwidth efficiency by
encapsulating enterprise broadcast traffic
inside provider unicast packets. Addi-
tionally, the 802.1ah Provider Backbone
Bridge implementation uses the MAC
addresses of the Ethernet UNIs (ingress
ports), rather than customer MACs in
the switch forwarding tables. This elimi-
nates the “MAC address explosion” issue
by greatly reducing the number of MAC
addresses that must be learned and
maintained by switches in the service
provider’s core infrastructure. Keeping
the number of MAC addresses to a
minimum reduces the aging out and
relearning of MAC addresses, thus
enhancing end-to-end performance and
making network forwarding far more
stable.
The Metro Ethernet Routing
Switch 8600 delivers high
performance, carrier-class
Ethernet switching functions
for key service provider and
large enterprise applications:
• Broadband managed
services to apartments,
condominiums, office
parks, campuses and more
• Carrier-class Ethernet
VPNs for seamless
LAN/MAN/WAN
connectivity
• Point-of-presence
(PoP) edge-to-core
traffic aggregation
• Efficient mobile backhaul
of 3G/4G traffic
• Latency-sensitive and
high availability data
center applications
Table 2. Metro Ethernet Routing
Switch 8600 scalability
Switch 8600 scalability
Scalability parameter
Maximum
Unique service
16,000,000+
identifiers
Customer VLANs
4,000
per UNI port
Provider Bridge VLANs
4,000
per UNI port
EVPN service instances
30,000
per chassis (e.g. E-LINE,
E-LAN, E-TREE)
E-LAN, E-TREE)