Generalized MPLS Introduction and Deploymentd2zmdbbm9feqrf.cloudfront.net/2013/usa/pdf/BRKMPL-3010.pdf · Generalized MPLS Introduction and Deployment Session BRKMPL-3010 . Santiago

Generalized MPLS Introduction and Deployment Session BRKMPL-3010

Santiago Álvarez

Distinguished Engineer

[email protected]

mailto:[email protected]

© 2013 Cisco and/or its affiliates. All rights reserved. BRKMPL-3010 – [email protected] Cisco Public

Agenda

Motivation

Technology Overview

Dynamic Optical Path Setup

Diverse Optical Path Setup

Deployment Considerations

Summary

3



IP Traffic Growing Sharply

15 billion networked devices in 2015, up from 7 billion in 2010

IP traffic will grow 4-fold from 2010 to 2015 (32% CAGR )

Mobile data traffic will grow 26-fold from 2010 to 2015 (92% CAGR )

IP traffic will reach an annual run rate of 965.5 Exabytes in 2015 (equivalent to 241 billion DVDs )

Mobile was 1% of total IP traffic in 2010, and will be 8% of total IP traffic in 2015

4

Source: Cisco Visual Networkin Index (VNI) www.cisco.com/go/vni


http://www.cisco.com/go/vni


Convergence Requires Network Agility Eliminating Rigid, Costly, Separate Networks

5

Data Center A

Data Center B

Data Center C Transport Network

IP Engineering requests path from transport team

1

Transport Planning researches capacity for best path

2

Transport Operations provisions network path at each node

3

IP Operations provisions VPN service

4

1 Week 3 Weeks 4 Weeks 2 Weeks

IP Network

Divided Networks

Up to 2 Months



Elastic Network: Agile and Efficient nLight Technology

6

Existing 10G Fiber, Amplifiers, Dispersion Compensation Modules, …

CRS ASR 9000

Core

Up to 36% TCO Savings and over 90% Fiber CAPEX Reuse

Edge Reuse over 90% of Fiber Infrastructure CAPEX

Reduce Provisioning Time from Months to Minutes

Recycle Capacity by Eliminating Over Provisioning

• nLight Control Plane – built on GMPLS • nLight Silicon for Coherent 100G+, 3000km w/o Regeneration • nLight ROADMs: Zero-Touch Optical



nLight GMPLS Use Cases

7

Packet Domain

Optical Domain

R1

Packet Domain

R2 R3

R1 R2

R3

Path Diversity

Disjoint paths

Disjoint paths

Dynamic Path Setup

Packet Domain

Optical Domain

R1

Packet Domain

R2

R1 R2

Signaled lambda

Signaled lambda


Technology Overview


GMPLS Introduction

Generalized control plane for different types of network devices – Packet-Switch Capable (PSC) – Layer-2 Switch Capable (L2SC) – Time-Division-Multiplex Capable (TDM) – Lambda-Switch Capable (LSC) – Fiber-Switch Capable (FSC)

Two major models: peer (NNI) and overlay (UNI)

Different label formats depending on network type

Based on initial RSVP-TE, OSPF-TE and ISIS-TE extensions

Strict separation of control and forwarding planes

Supports bi-directional LSPs

IP based control plane

No IP based forwarding plane (no LDP)

9



GMPLS UNI Introduction

User-Network Interface (UNI) to implement an overlay model between two networks

Enables a Cisco router to signal paths dynamically through a DWDM network

Paths may be signaled with diversity requirements

Two UNI components – Client: UNI-C in IOS XR 4.3.0 (CRS / ASR9000) – Network: UNI-N in 9.6.0.3 (ONS 15454)

Part of nLight Control Plane

Building block for multi-layer routing

10

H E L L O my name is

I IPP

H E L L O my name is

Optical



GMPLS UNI – Reference Model (IP+Optical)

Control plane interface – Client: UNI-C (packet) – Network: UNI-N (optical)

Separate packet and optical routing domains

Optical topology known to UNI-N but not to UNI-C

UNI-C initiates LSP signaling

UNI-N performs path computation through optical domain

Common address space between UNI-C and UNI-N to enable signaling

UNI honors administrative boundaries while allowing controlled interaction

11

UNI-C UNI-C

UNI-N UNI-N

Packet Domain

Optical Domain

UNI UNI Head Tail

RSVP RSVP RSVP RSVP

Forwarding plane

Control plane



IP Communication Channel (IPCC)

Used by GMPLS nodes to exchange control-plane information – Signaling – Routing – Link management

Control channels exist independently of TE links

Not required to use same physical medium as data-bearing links – Separate wavelength/fiber – Ethernet link – Overhead bits – IP tunnel

12

UNI-C

UNI-N

Packet Domain

Optical Domain

UNI Head

TE Link

IPCC



Link Management Protocol (LMP)

Performs two core functions – Control channel management – Link property correlation

GMPLS nodes require an LMP adjacency formed over one or more bi-directional control channels

Runs over UDP with mechanisms for reliable message transmission

Includes mechanisms for LMP neighbor discovery

Most messages exchanged over control channel

Can also provide link connectivity verification and fault management

13


Dynamic Optical Path Setup


GMPLS UNI Dynamic Path Setup IOS XR 4.3.0

Router can signal a path dynamically through an optical (ONS 15454) network using GMPLS

Router initiates signaling

ROADM computes path and signals optical path

LSP state drives controller and physical interface state on router

Support for HA including ISSU

Router interface is fully layer-3 and Layer-2 capable (including bundling)

Router interface may or may not run MPLS

15

Packet Domain

Optical Domain

R1

Packet Domain

R2

R1 R2

Signaled lambda

Signaled lambda



Path Computation and Signaling

UNI-C (Head) – Initiates signaling (default lambda) – No explicit path (ERO) defined / signaled – Signaling initiated towards remote UNI-C (optical loopback or optical link address) – Bi-directional path (upstream and downstream labels)

UNI-N – Arrival of PATH message without ERO triggers path computation to destination across

optical domain – Establishment of optical path (trail) required for UNI signaling to proceed

16



Signaling –Path Setup

Optical impairment check

UNI PATH (upstream label = lambda)


UNI-C UNI-C UNI-N UNI-N

UNI PATH (upstream label = default lambda)

1

2

3 Trail Downstream PATH

Trail Upstream PATH

Trail Downstream RESV

Trail Upstream RESV

UNI PATH ERROR (upstream label = lambda)


6 Trail established

8

Tunnel established

UNI RESV (Label = lambda)



7

Tunnel established

5 Trail established


Per-hop optical parameters

4

Head initiates tunnel

signaling

Optical path computation, trail signaling initiated

17



Generalized Label for Lambda-Switch-Capable (LSC) Label Switching Routers

18

Identifier Grid Channel Spacing n

Grid Value Reserved 0

ITU-T DWDM 1

ITU-T CWDM 2

Future Use 3 - 7

3 bits

4 bits

9 bits

16 bits

DWDM Channel Spacing (GHz) Value

Reserved 0 100 1 50 2 25 3

12.5 4 Future Use 5 - 15

Frequency (THz) = 193.1 THz + n * channel spacing (THz)

Grid – Optical grid as defined in ITU-T G.694.1 Channel Spacing – Spacing between DWDM channels in GHz Identifier – Per-node distinguisher between lasers than can transmit same lambda n – value used to compute frequency (two’s complement)



DWDM Interface State with GMPLS

Physical interface goes up when GMPLS signaling complete and wavelength programmed on controller

Interface goes down if tunnel brought down (signaling error, configuration removal)

Interface stays up if control plane goes down (e.g. RP failure) and no error is generated

19

UP

DOWN

Admin shutdown or Signaling error or

OIR or GMPLS config removal

Signaling complete and Hardware programmed

Transient control plane failure



Configuration Framework Three main configuration tasks

– TE Link – IP Control Channel – Tunnel (head only)

DWDM controller associated with GMPLS UNI configuration

No tunnel interface (e.g. tunnel-gte) associated with GMPLS LSP

Single tunnel path option

Tunnel id cannot conflict with any other point-to-point TE tunnel Id including auto-tunnel

LMP configuration on separate config submode (config under traffic-eng submode deprecated)

No configuration changes on physical interface (fully layer-2 and layer-3 capable including bundling)

20

UNI-C

UNI-N

Packet Domain

Optical Domain

UNI Head

TE Link

IPCC



Head-end Base Configuration

21

interface Loopback0 description PACKET ROUTER ID ipv4 address 10.0.255.1 255.255.255.255 ! interface Loopback1 description OPTICAL ROUTER ID ipv4 address 172.16.255.11 255.255.255.255 ! interface GigabitEthernet0/0/0/8 description OPTICAL CONTROL PLANE ipv4 address 172.16.1.0 255.255.255.254 ! interface HundredGigE0/1/0/0 description LOOK MOM: I WAS SIGNALED VIA GMPLS ipv4 address 10.0.0.0 255.255.255.254 ! controller dwdm0/1/0/0 admin-state in-service ! router static address-family ipv4 unicast 172.16.255.1/32 172.16.1.1 ! !

Optical router id must be reachable

UNI-C UNI-C

UNI-N UNI-N

Packet Domain

Optical Domain

UNI UNI Head Tail

RSVP RSVP RSVP RSVP rid:172.16.255.1 rid: 172.16.255.2

rid:172.16.255.11 rid: 172.16.255.22 rid: 10.0.255.1 rid: 10.0.255.2

Packet routing Domain: 10/8

Optical routing Domain: 172.16/16 (IPCC) 172.17/16 (Link Id)

link-id: 172.17.1.0

link-id: 172.17.1.1

172.16.1.0

172.16.1.1

link-id: 172.17.2.0

link-id: 172.17.2.1

172.16.2.0

172.16.2.1



Head-end Base Configuration (cont.)

22

mpls traffic-eng gmpls optical-uni controller dwdm0/1/0/0 tunnel-properties tunnel-id 100 destination ipv4 unicast 172.17.2.0 path-option 10 no-ero lockdown ! ! ! ! end

lmp gmpls optical-uni controller dwdm0/1/0/0 neighbor HEAD-UNI-N neighbor link-id ipv4 unicast 172.17.1.1 neighbor interface-id unnumbered 11 link-id ipv4 unicast 172.17.1.0 ! neighbor HEAD-UNI-N ipcc routed router-id ipv4 unicast 172.16.255.1 ! router-id ipv4 unicast 172.16.255.11 ! ! rsvp controller dwdm0/1/0/0 signalling refresh out-of-band interval 86400 ! !

Static Control Channel Adjacency (routable)

Optical Router Id (routable)

GMPLS Tunnel Configuration

Static TE Link Properties

(non routable)

Daily RSVP State Refresh



Tail-end Base Configuration

23

UNI-C UNI-C

UNI-N UNI-N

Packet Domain

Optical Domain

UNI UNI Head Tail

RSVP RSVP RSVP RSVP rid:172.16.255.1 rid: 172.16.255.2

rid:172.16.255.11 rid: 172.16.255.22 rid: 10.0.255.1 rid: 10.0.255.2



link-id: 172.17.1.0

link-id: 172.17.1.1

172.16.1.0

172.16.1.1

link-id: 172.17.2.0

link-id: 172.17.2.1

172.16.2.0

172.16.2.1





Tail-end Base Configuration (cont.)

24

mpls traffic-eng gmpls optical-uni controller dwdm0/1/0/0 ! ! ! end

lmp gmpls optical-uni controller dwdm0/1/0/0 neighbor TAIL-UNI-N neighbor link-id ipv4 unicast 172.17.2.1 neighbor interface-id unnumbered 22 link-id ipv4 unicast 172.17.2.0 ! neighbor TAIL-UNI-N ipcc routed router-id ipv4 unicast 172.16.255.2 ! router-id ipv4 unicast 172.16.255.22 ! ! rsvp controller dwdm0/1/0/0 signalling refresh out-of-band interval 86400 ! !


No GMPLS Tunnel Configuration

(tunnel still bidirectional)




(non routable)


Diverse Optical Path Setup


GMPLS UNI Diverse Path Setup IOS XR 4.3.0

Router head can signal requirements for path diversity against one or more specific LSPs

ROADM includes path diversity requirements in path computation

Source and destination of signaled LSP may differ from LSP from which diversity is required

26

Packet Domain

Optical Domain

R1

Packet Domain

R2 R3

R1 R2

R3 Disjoint paths

Disjoint paths



Diverse Path Computation and Signaling

UNI-C (Head) – Initiates signaling (default lambda) – No explicit path (ERO) defined/signaled – LSP exclusions (XRO) signaled to enable path diversity – Exclusions can be strict (MUST exclude) or best effort (SHOULD exclude) – Signaling initiated towards remote UNI-C (optical loopback or optical link address) – Bi-directional path (upstream and downstream labels)

UNI-N – Arrival of PATH message without ERO triggers optical path computation to destination

across optical domain – LSP exclusions used as additional input for optical path computation – Establishment of optical path (trail) required for UNI signaling to proceed

27



Signaling – Diverse Path Setup

28



UNI-C UNI-C UNI-N UNI-N

UNI PATH (upstream label = default lambda)

1

Head initiates tunnel

signaling including

LSP exclusion

2

Optical path computation subject to LSP exclusions,

trail signaling initiated

3 Trail Downstream PATH

Trail Upstream PATH

Trail Downstream RESV

Trail Upstream RESV

UNI PATH ERROR (upstream label = lambda)


6 Trail established

8

Tunnel established




7

Tunnel established

5 Trail established

Per-hop optical parameters

4





Head-end Base Configuration

29



UNI-C UNI-C

UNI-N UNI-N

Packet Domain

Optical Domain

UNI UNI Head Tail

RSVP RSVP RSVP RSVP rid:172.16.255.

1 rid: 172.16.255.2

rid:172.16.255.11 rid: 172.16.255.22 rid: 10.0.255.1 rid: 10.0.255.2



link-id: 172.17.1.0

link-id: 172.17.1.1

172.16.1.0

172.16.1.1

link-id: 172.17.2.0

link-id: 172.17.2.1

172.16.2.0

172.16.2.1



Head-end Base Configuration (cont.)

30

mpls traffic-eng attribute-set xro exclude-tun1-be exclude best-effort lsp source 172.16.255.11 destination 172.16.255.22 tunnel-id 1 extended-tunnel-id 172.16.255.11 ! attribute-set xro exclude-tun1-s exclude strict lsp source 172.16.255.11 destination 172.16.255.22 tunnel-id 1 extended-tunnel-id 172.16.255.11 ! gmpls optical-uni controller dwdm0/1/0/0 tunnel-properties tunnel-id 100 destination ipv4 unicast 172.17.2.0 path-option 10 no-ero xro-attribute-set exclude-tun1-s lockdown ! ! ! !

lmp gmpls optical-uni controller dwdm0/1/0/0 neighbor HEAD-UNI-N neighbor link-id ipv4 unicast 172.17.1.1 neighbor interface-id unnumbered 11 link-id ipv4 unicast 172.17.1.0 ! neighbor HEAD-UNI-N ipcc routed router-id ipv4 unicast 172.16.255.1 ! router-id ipv4 unicast 172.16.255.11 ! ! rsvp controller dwdm0/1/0/0 signalling refresh out-of-band interval 86400 ! !



GMPLS Tunnel Configuration include diversity requirement


(non routable)


Best effort (non-mandatory) path

diversity requirement

Strict (mandatory) path diversity requirement

* As of introduction of IOS XR 4.3.0, UNI-N does not support best effort exclusions


Deployment Considerations


Concurrent Static and Dynamic (Signaled) Lambda Configuration

Controller can be configured with static in addition to GMPLS UNI signaling

If signaling successful, signaled lambda takes precedence over static lambda

Adding GMPLS UNI configuration to an operational controller with a static lambda expected to initiate signaling for existing lambda and not disrupt traffic

32



MPLS-TE and GMPLS Co-existence (IOS XR 4.3.0)

Router would have two RSVP neighbors if packet network runs MPLS-TE on DWDM interface, – RSVP neighbor over physical interface

for MPLS TE signaling – RSVP neighbor over controller for

GMPLS signaling

Separate RSVP refresh timers – High frequency for MPLS TE signaling – Low frequency for GMPLS signaling

(lowest 232 ms or ~1.6 months)

33

Packet Domain

Optical Domain

R1 R2

Signaled lambda

RSVP

RSVP



GMPLS vs. MPLS TE (IOS XR 4.3.0)

34

Header GMPLS LSP TE LSP Path Bidirectional (upstream+downstream) Unidirectional (Downstream)

End Point Roles One head + one tail

One head + one tail (P2P) or multiple tails (P2MP)

Label DWDM Wavelength Label (32 bits) in control plane Circuit in forwarding plane

Packet label (20-bit) in control plane Packet label (20-bit part of shim header) in forwarding plane

Path Computation UNI-N Head End Signaling Initiation Head End Head End

Physical Interface Relationship 1:1 (fixed) N:1 (flexible)

Signaling Routing Objects No ERO

Optional XRO RRO (optional)

ERO RRO (optional)

Signaling Label Objects

Generalized Label Request (PATH) Upstream Label (PATH)

Generalized Label (RESV) Acceptable Label Set (PATH)

Label Request (PATH) Label (RESV)

Signaled Bandwidth Fixed CT0 (controller rate) Configurable CT0/CT1 Reservation Style Fixed Filter (FF) Shared Explicit (SE)

Tunnel Id Static Static | Dynamic (auto-tunnel) Tunnel Destination UNI-C optical router id | UNI-C optical link address Router id | Interface id

Protection N/A FRR | Path protection Preemption N/A Hard | Soft

Re-optimization N/A Hitless



Product Support

IOS XR Release 4.3.0 – Available now!

CRS hardware support – 1OC768-DPSK/C – 1OC768-DPSK/C-O= – 1OC768-ITU/C – 4-10GE-ITU/C – 1-100GE-DWDM/C (=)

ASR 9000 hardware support – Mod80 and Mod160 LCs (4-port/2-port 10GE MPA) w/ 8xDWDM-XFP-C (DWDM optics) – 24 x 10GE LC with 10GE SFP+ DWDM optics

ONS 15454 Rel. 9.6.0.3

35


Summary


Summary

Explosive traffic growth and changing traffic patterns driving requirements for agile IP+Optical integration

Cisco nLight uses GMPLS as control plane to enable an elastic network infrastructure

Cisco GMPLS UNI implementation allows controlled interaction between packet and optical domains to – Dynamically set up paths between routers across a DWDM network – Signaling and computation of diverse optical paths

Solution available in Cisco CRS, ASR 9000 and ONS 15454 products today

37



MPLS Content at Cisco Live US 2013 BRKMPL-1100 - Introduction to MPLS BRKMPL-2100 -Deploying MPLS Traffic Engineering BRKMPL-2101 - Deploying MPLS-based Layer 2 Virtual Private Networks BRKMPL-2102 - Deploying MPLS-based IP VPNs BRKMPL-2108 - Designing MPLS in Next Generation Data Center: A Case Study BRKMPL-2109 - MPLS Solutions for Cloud Networking BRKMPL-2333 - E-VPN & PBB-EVPN: the Next Generation of MPLS-based L2VPN BRKMPL-3010 - Generalized MPLS - Introduction and Deployment BRKMPL-3101 - Advanced Topics and Future Directions in MPLS LTRMPL-2102 - Enterprise Network Virtualization using IP and MPLS Technologies: Introduction LTRMPL-3100 - Unified MPLS Lab LTRMPL-3102 - Enterprise Network Virtualization using IP and MPLS Technologies: Advanced PNLSPG-3999 - Transport Evolution in SP Core Networks TECMPL-3100 - Unified MPLS - An architecture for Advanced IP NGN Scale TECMPL-3200 - SDN WAN Orchestration in MPLS and Segment Routing Networks

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Documents

Generalized MPLS Introduction and Deploymentd2zmdbbm9feqrf.cloudfront.net/2013/usa/pdf/BRKMPL-3010.pdf · Generalized MPLS Introduction and Deployment Session BRKMPL-3010 . Santiago