Cisco Catalyst 6500 Supervisor 2T Technical Highlights by irisdan


									      Cisco Catalyst 6500 Supervisor 2T Technical Highlights

          – Will Sup2T Stop You From Buying Nexus?
Supervisor 2T engine for the Catalyst 6500E chassis. The Sup2T is a boost to keep the
6500′ s legs running a little longer. I think of the 2T as a product enabling customers
with a large 6500 investment to put off the inevitable migration to the Nexus
platform. The 2T, by all accounts, is the end of the development roadmap for the
6500. My understanding is that the 2T takes the 6500 chassis as far as it can scale in
terms of packet forwarding performance.

With the advent of the Nexus 7009, I doubt we’ll see yet another replacement 6500
chassis model (like we saw the “E” some years back). The Nexus uptake has been
reasonably good for most Cisco shops, and the Nexus 7009 form factor takes away
the physical space challenges faced by those previously considering the 7010 as a
forklift upgrade for the widely deployed 6509. In my mind, it makes sense for Cisco to
focus their Catalyst development efforts on the Catalyst 4500 line for access and
campus deployments, with Nexus products running NX-OS for core routing services
and data center fabric. Could I be wrong? Sure. If Cisco announced a new 6500E
“plus” chassis that can scale higher, than that would reflect a customer demand for
the product that I personally don’t see happening. Most of the network engineering
community is warming up to the Nexus gear and NX-OS.

That baseline established, Cisco is selling the Sup2T today. What does it bring to the
table? Note that anything in italics is lifted directly from the Cisco architecture
document referenced below in the “Links” section.
     Two Terabit (2080 Gbps) crossbar switch fabric. That’s where the “2T” comes
       from. These sups are allowing for forwarding performance up to 2 Tbps. Of
       course, as with previous supervisor engines, the aggregate throughput of the
       chassis depends on what line cards you deploy in the chassis. That old
       WS-X6148A you bought several years ago isn’t imbued with magical
       forwarding powers just because you pop a 2T into the chassis.
     The Supervisor 2T is designed to operate in any E-Series 6500 chassis. The
       Supervisor 2T will not be supported in any of the earlier non E-Series
       chassis. You know that non-E 6500 chassis running Sup720s you love so much?
       Gotta go if you want to upgrade to a 2T (to which I ask the question if you’re
       considering this…why not Nexus 7009 instead?)
     As far as power requirements, note the following:
            The 6503-E requires a 1400 W power supply and the 6504-E requires a
               2700 W power supply, when a Supervisor 2T is used in each chassis.
            While the 2500 W power supply is the minimum-sized power supply
               that must be used for a 6, 9, and 13-slot chassis supporting Supervisor
               2T, the current supported minimum shipping power supply is 3000 W.
     Line cards are going to bite you; backwards compatibility is not what it once
       was. There’s a lot of requirements here, so take note.
           The Supervisor 2T provides backward compatibility with the existing
              WS-X6700 Series Linecards, as well as select WS-X6100 Series
              Linecards only.
           All WS-X67xx Linecards equipped with the Central Forwarding Card
              (CFC) are supported in a Supervisor 2T system, and will function in
              centralized CEF720 mode.
           Any existing WS-X67xx Linecards can be upgraded by removing their
              existing CFC or DFC3x and replacing it with a new DFC4 or DFC4XL.
              They will then be operationally equivalent to the WS-X68xx linecards
              but will maintain their WS-X67xx identification.
           There is no support for the WS-X62xx, WS-X63xx, WS-X64xx, or
              WS-X65xx Linecards.
           Due to compatibility issues, the WS-X6708-10GE-3C/3CXL cannot be
              inserted in a Supervisor 2T system, and must be upgraded to the new
           The Supervisor 2T Linecard support also introduces the new WS-X6900
              Series Linecards. These support dual 40 Gbps fabric channel
              connections, and operate in distributed dCEF2T mode.

To summarize thus far, a legacy 6500 chassis will need to be upgraded to a 6500E.
Many older series line cards are not supported at all, or will require a DFC upgrade.
Power supplies are a consideration, although the base requirements are not
egregious. Therefore, moving to a 2T will require a good bit of technical and
budgetary planning to get into a Sup2T. I suspect that for the majority of customers,
this will not be a simple supervisor engine swap.

This diagram from Cisco shows the hardware layout of the Sup2T, focusing on all the
major junction points a packet or frame could crossed through depending on ingress
point, required processing, and egress point.
There are two main connectors here to what Cisco identifies as two distinct
backplanes: the fabric connector, and the shared bus connector. The fabric
connector provides the high-speed connectors for the newer line cards, such as the
new 6900 series with the dual 40Gbps connections mentioned above. The shared
bus connector supports legacy cards (sometimes referred to as “classic” cards), that
is linecards with no fabric connection, but rather connections to a bus shared with
similarly capable cards.

The crossbar switch fabric is where the throughput scaling comes from. Notice that
Cisco states there are “26 x 40″ fabric channels in the diagram. That equates to the
2080Gbps Cisco’s talking about. The crossbar switch fabric on the Supervisor 2T
provides 2080 Gbps of switching capacity. This capacity is based on the use of 26
fabric channels that are used to provision data paths to each slot in the chassis. Each
fabric channel can operate at either 40 Gbps or 20 Gbps, depending on the inserted
linecard. The capacity of the switch fabric is calculated as follows: 26 x 40 Gbps =
1040 Gbps; 1040 Gbps x 2 (full duplex) = 2080 Gbps.

“Full-duplex” means that what we’re really getting is 1Tbps in one direction, and
1Tbps in the other direction. The marketing folks are using weasel words to say that
the Sup2T is providing a 2 terabit fabric. This marketing technique is neither new nor
uncommon in the industry when describing speeds and feeds, but it is something to
keep in mind in whiteboard sessions, especially if you’re planning a large deployment
with specific data rate forwarding requirements.
Now here’s a strange bit. While the crossbar fabric throughput is described in the
context of full-duplex, the 80Gbps per-slot is not. The 80 Gbps per slot
nomenclature represents 2 x 40 Gbps fabric channels that are assigned to each slot
providing for 80 Gbps per slot in total. If marketing math were used for this per slot
capacity, one could argue that the E-Series chassis provides 160 Gbps per slot.

Moving onto the control-plane functions of the Sup2T, we run into the new
MSFC5. The MSFC5 CPU handles Layer 2 and Layer 3 control plane processes, such
as the routing protocols, management protocols like SNMP and SYSLOG, and Layer 2
protocols (such as Spanning Tree, Cisco Discovery Protocol, and others), the switch
console, and more. The MSFC5 is not compatible with any other supervisor. The
architecture is different from previous MSFC’s, in that while previous MSFC’s sported
a route processor and a switch processor, the MSFC5 combines these functions into a
single CPU.

The diagram also show a “CMP”, which is a feature enhancement of merit. The CMP
is the “Connectivity Management Processor,” and seems to function like an iLO
port. Even if the route processor is down on the Sup2T, you can still access the
system remotely via the CMP. The CMP is a stand-alone CPU that the administrator
can use to perform a variety of remote management services. Examples of how the
CMP can be used include: system recovery of the control plane; system resets and
reboots; and the copying of IOS image files should the primary IOS image be
corrupted or deleted. Implicitly, you will have deployed an out-of-band network or
other remote management solution to be able to access the CMP, but the CMP
enhances our ability to recover a borked 6500 from far away.

The PFC4/DFC4 comprise the next major component of the Sup2T. The PFC4 rides as
a daughter card on the supervisor, and is the hardware slingshot that forwards data
through the switch. The DFC4 performs the same functions only it rides on a linecard,
keeping forwarding functions local to the linecard, as opposed to passing it through
the fabric up to the PFC4.

The majority of packets and frames transiting the switch are going to be handled by
the PFC, including IPv4 unicast/multicast, IPv6 unicast/multicast, Multi-Protocol Label
Switching (MPLS), and Layer 2 packets. The PFC4 also performs in hardware a
number of other functions that could impact how a packet is fowarded. This includes,
but is not limited to, the processing of security Access Control Lists (ACLs), applying
rate limiting policies, quality of service classification and marking, NetFlow flow
collection and flow statistics creation, EtherChannel load balancing, packet rewrite
lookup, and packet rewrite statistics collection.

The PFC performs a large array of functions in hardware, including the following list
I’m lifting from Cisco’s architecture whitepaper.
     Layer 2 functions:
              Increased MAC Address Support – a 128 K MAC address table is
              A bridge domain is a new concept that has been introduced with
                PFC4. A bridge domain is used to help scale traditional VLANs, as well
                as to scale internal Layer 2 forwarding within the switch.
              The PFC4 introduces the concept of a Logical Interface (LIF), which is
                a hardware-independent interface (or port) reference index associated
               with all frames entering the forwarding engine.
            Improved EtherChannel Hash – etherchannel groups with odd
               numbers of members will see a better distribution across links.
            VSS support – it appears you can build a virtual switching system right
               out of the box with the Sup2T. There does not seem to be a unique
               “VSS model” like in the Sup720 family.
            Per Port-Per-VLAN – this feature is designed for Metro Ethernet
               deployments where policies based on both per-port and per- VLAN
               need to be deployed.
      Layer 3 functions. There’s a lot here, and rather than try to describe them all,
       I’m just going to hit the feature names here, grouped by category. You can
       read in more detail in the architecture document I link to below.
            Performance: Increased Layer 3 Forwarding Performance
            IPv6: uRPF for IPv6, Tunnel Source Address Sharing, IPv6 Tunnelling
            MPLS/WAN: VPLS, MPLS over GRE, MPLS Tunnel Modes, Increased
               Support for Ethernet over MPLS Tunnels, MPLS Aggregate Label
               Support, Layer 2 Over GRE
            Multicast: PIM Register Encapsulation/De-Encapsulation for IPv4 and
               IPv6, IGMPv3/MLDv2 Snooping
            Netflow: Increased Support for NetFlow Entries, Improved NetFlow
               Hash, Egress NetFlow, Sampled NetFlow, MPLS NetFlow, Layer 2
               Netflow, Flexible NetFlow
            QoS: Distributed Policing, DSCP Mutation, Aggregate Policers,
               Microflow Policers
            Security: Cisco TrustSec (CTS), Role-Based ACL, Layer 2 ACL, ACL Dry
               Run, ACL Hitless Commit, Layer 2 + Layer 3 + Layer 4 ACL, Classification
               Enhancements, Per Protocol Drop (IPv4, IPv6, MPLS), Increase in ACL
               Label Support, Increase in ACL TCAM Capacity, Source MAC + IP
               Binding, Drop on Source MAC Miss, RPF Check Interfaces, RPF Checks
               for IP Multicast Packets

So, do you upgrade to a Sup2T? It depends. The question comes down to what you
need more: speed or features. The Sup2T is extending the life of the 6500E chassis
with speed and a boatload of features. That said, you can’t scale the Cisco 6500 to
the sort of 10Gbps port density you can a Nexus. Besides, most of the features found
on a 6500 aren’t going to be used by most customers. If your 6500 is positioned as a
core switch, then what you really need is the core functionality of L2 and L3
forwarding to be performed as quickly as possible with minimal downtime. To me,
the place to go next is the Nexus line if that description of “core” is your greatest

If instead you need a super-rich feature set, then the question is harder to answer.
The Nexus has a ways to go before offering all of the features the Catalyst does.
That’s not to say that all a Nexus offers is throughput. True, NX-OS lacks the maturity
of IOS, but it offers stability better than IOS-SX and features that most customers

In some ways, I’m making an unfair comparison. Nexus7K and Cat6500 have different
purposes, and solve different problems. But for most customers, I think either
platform could meet the needs. So if you’re looking for a chassis you can leave in the
rack for a very long time, it’s time to look seriously at Nexus, rejecting it only if
there’s some specific function it lacks that you require. If the Nexus platform can’t
solve all of your problems, then you probably have requirements that are different
from merely “going faster”. The 6500/Sup2T may make sense for you.

---Original reading from

The Supervisor 2T provides 2-terabit system performance for 80Gbps switching
capacity per slot on all Catalyst 6500 E-Series Chassis. As a result, you can:
    Maintain investment protection through backward compatibility
    Deliver scalability and performance improvements such as distributed
       forwarding (dCEF) 720Mpps with the fourth-generation Policy Feature Card
    Support future 40Gbps interface and nonblocking 10Gbps modules
    Enable new applications and services with hardware accelerated VPLS, Layer
       2 over mGRE for Network Virtualization
    Take advantage of integrated Connectivity Management Processor (CMP) for
       improved out-of-band management.

More Related Cisco Catalyst 6500 Supervisor 2T Review:
Catalyst 6500 Supervisor 2T May Not be Your Upgrade Answer

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