Transcript Circuit-switched High-speed End-to-End Transport arcHitecture (CHEETAH)

Circuit-switched High-speed End-to-End Transport
arcHitecture (CHEETAH)
Cisco 12000 series router
Internet
Cisco 12000 series router
Cisco MSPP 15454
Cisco 12000 series router
Cisco MSPP 15454
SONET network cloud
Connection to primary 10/100M NIC
Connection to secondary GbE NIC for uplink
Cisco MSPP 15454
Connection to third 10/100M NIC for downlink
OC-48c links
CHEETAH circuit
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
The Router Disconnect Experiment
Objectives:
• Efficient utilization of the optical circuit
– In default mode, the circuit is used for TCP/IP traffic.
– In CHEETAH mode, part of the bandwidth is
dynamically setup and released upon request for
large file transfers.
• Avoid TCP/IP traffic loss
– During mode transfer from default to CHEETAH, we
need to avoid loss of TCP/IP packets.
– Maintain connectivity between routers for TCP/IP
traffic and CHEETAH signaling.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
The Router Disconnect Experiment
Possible solutions
• Disable one of the router interface cards.
– Waiting for OSPF to update the routing table
leads to TCP/IP packet loss.
• Link bundling
– Avoids Loss of TCP/IP packets.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link bundling (1)
What is link bundling
• Grouping multiple point-to-point links
together into one logical link to provide
higher bandwidth (a bigger pipe),
redundancy, and load sharing between
two routers.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link bundling (2)
Cisco 12000 Series Internet Routers support
the following types of link bundling :
• Gigabit EtherChannel is used to bundle
multiple Gigabit Ethernet (GE) interfaces.
• POS Channel is used to bundle multiple
Packet-over-SONET (POS) interfaces.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link bundling (3)
Benefits
• Flexible, incremental bandwidth
• Transparency to network applications
• Load balancing (equal cost) across all active links on the
bundle
• Out-of-service support: a Gigabit EtherChannel or POS
Channel is brought down if the minimum number of GE or
POS links are not up.
• Bandwidth propagation support: bandwidth changes in a
Gigabit EtherChannel or POS Channel can be (optionally)
propagated to the upper-layer protocols until the amount
of bandwidth required in the link bundle exceeds a
specified threshold.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link bundling (4)
How it works
• A Gigabit EtherChannel or POS Channel link bundle is
created on a line card or across multiple line cards.
• An adjacency representing the new bundle is created in
the forwarding information base (FIB) table on the gigabit
route processor (GRP) and is forwarded to all the line
cards. This adjacency represents a virtual link and has
pointers to individual links in the bundle.
• As incoming data packets are received by the router, the
line card recognizes the virtual adjacency, and properly
routes and load balances the packets across the subadjacencies represented by the virtual adjacency. Packets
are properly routed and load balanced towards the bundle,
and then properly transmitted across the bundle.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link Bundling in CHEETAH
Host
Cisco 12404
Primary 10/100M NIC
8-port fast Ethernet card
Route processor card
Second BbE NIC
4-port OC-12 POS line card
Third 10/100M NIC
Internet
Link bundle
Control card
4-port OC-12 card
10/100M
Ethernet card
GbE card
OC48ELR
ITU
optics
card
Cisco MSPP 15454
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
SONET network cloud
Link Bundling in CHEETAH
(continuous)
• The four OC-12 links between Cisco 12000
series router and MSPP can be bundled
together as one logical link.
• Before the mode transfer from default to
CHEETAH, upon receiving the signaling
message,3 out of the 4 member links can be
removed, the router automatically route the
TCP/IP packet to the left member links. No
TCP/IP packets are lost. The removed member
links are used for CHEETAH circuit setup and
can be restored for TCP/IP after the CHEETAH
circuit is released.
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link Bundling Configuration Example
1. Create bundled link logical Interface -pos-channel interface, then assign an IP
address
• Router1# configure terminal (Start configuring
bundled link)
• Router1(config)# interface pos-channel 1
(Create a logical port-channel interface, for
Gigabit etherChannel, replace ‘pos-channel 1’
with ‘port-channel 1’)
• Router1(config-if)# ip address 41.1.0.1
255.255.0.0 (Assign an IP address and subnet
mask to the logical port-channel)
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link Bundling Configuration Example
(continuous)
2. Assign a Packet-over-SONET interfaces to the poschannel interface.
• Router1(config)# interface pos2/0 (Create or modify an existing
Packet-over-SONET interface and enter interface configuration
mode. For Gigabit etherChannel, replace ‘pos2/0’ with
‘gigabitethernet2/0’).
• Router(config-if)# channel-group 1 (Assign the POS interface to the
POS Channel associated with the specified channel number).
• Continue? [yes]: yes ((Optional) Enter yes at the command prompt
to configure the Packet-over-SONET interface as a member of the
pos-channel group. The interface’s IP address and loopback
configuration are deleted).
• Router1(config-if)# exit (Exits interface configuration mode. Repeat
Step 1 through Step 4 to add up to eight POS interfaces to the POS
Channel bundle).
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Link Bundling Configuration Example
(continuous)
3. Remove one of packet-over-SONET
interfaces from a link bundle
• Router1(config)# interface pos2/0 (Specify a
Packet-over-SONET interface and enter
interface configuration mode, for Gigabit
Ethernet interface, replace ‘pos’ with
‘gigabitethernet’).
• Router1(config)# no channel-group 1 (Remove
the GE or POS interface from a Gigabit
EtherChannel or POS Channel).
• Router1(config-if)# end (Exit interface
configuration mode).
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Project Implementation
• People Involved
– Prof. Ibrahim Habib
– Ph.D. candidate Qiang Song
– Ph.D. Candidate (TBD)
• Equipment to be purchased
– Cisco 12000 series router
– Two high performance PCs
– 2 Gigabit Ethernet cards
CUNY (NSF Planing Meeting,
11/12/03, Virginia)
Year 1 Work Plan
1. Configuring, and experimenting with the
Cisco 12000 router (1st Quarter)Emulate the operation of two routers.
2. Link Bundling configuration, testing, and
verification (2nd Quarter).
3. Documentations and delivery of results
(4th Quarter).
CUNY (NSF Planing Meeting,
11/12/03, Virginia)