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Simplifying Data Center migrations using LISP, from 42 years to 2 years
CCSDCT-1100
Patrice Bellagamba, Distinguished System Engineer
Santiago Freitas, Customer Solutions Architect
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Session Objectives • Explain how a Customer was able to reduce by 95% the migration
window time required to migrate applications from one DC to another.
• Provide an overview of how the technology used works: LISP enabled on ASR 1000.
• Cover the benefits of using a Layer 3-based migration technique.
• Share the Testing Results including Scale, Latency, Convergence Time and Performance.
2
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Agenda • Problem statement
• The impact of LISP on Data Center Migrations
• Technical Overview: LISP enabled on ASR 1000
• Implementation Details
• Testing Results – Scale, Latency, Convergence Time and Performance
• Conclusion
3
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
DC Migration without IP mobility / IP Retention Application Migration – Moving resources WITH changing IP addressing
4
• DNS may not always help with legacy hard coded applications
• Applications local and remote may need to be amended
• Firewalls need to be amended
§ Takes longer to start moving servers due to data gathering / documentation of legacy application interfaces
§ Risk – has an interface been overlooked?
• Risk - Can you be sure you have the complete picture?
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
DC Migration without IP mobility / IP Retention
Application Migration – Moving resources WITHOUT changing IP addressing
5
Without IP Mobility, it requires to move all server of a subnet together Problem with Affinity Groups:
Move requires understanding of server VLAN cross-patching / affinity groups if smaller units of servers to be migrated in one event
Subnet A Subnet B Subnet C
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
DC Migration – Server Physical Move
Move of Affinity Groups – The Reality
6
Move the server and patch into new infrastructure: § Takes longer to start moving servers due to data gathering and
understanding of virtual server network interfaces. § Requires understanding of server VLAN cross-patching & affinity groups
if smaller units of servers to be migrated in one event § Conflicting VLAN numbering in switch blocks – virtual server VLAN re-
configuration required during migration event § Risk – has a server or VLAN cross connection been overlooked? § Server virtualisation / platform refresh is a follow on project
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
DC Migration – Big Bang
Every Server Migrated in Single Migration Event (Physical Move or Re-build)
7
Without a solution that enables IP mobility with IP Retention for each server then ‘Big Bang’ approach implies:
§ Years in Planning - takes longer to start moving servers due to data gathering and move planning
§ Longer storage migration cycle that requires keeping a large data set in synch over WAN (or other methods)
§ High risk / large service outage during migration event § Cast of thousands / large workforce required
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
A solution that delivers IP mobility / IP Retention Cisco Locator/ID Separation Protocol (LISP)
WAN
Brownfield Data Center Greenfield Data Center
IP
• Pluggable, Non-Disruptive Migration Network • Keeps the Same IP address on the Server during the migration • Works for all types of Servers (i.e. x86 and all others) – Physical or Virtual (Hypervisor Agnostic) • Removes affinity group constraints
IP 10.1.1.5 IP 10.1.1.6 IP 10.1.1.7
WAN
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
DC Migration with IP mobility / IP Retention
• Customer can perform the server migrations in much smaller waves which lowers the risk of the project.
• Server Migration can begin much faster, as soon as the data for that server is available on Customer’s DC.
• The amount of data to be kept in synch is minimized, reducing risk and WAN requirements.
• Path optimization from the user to the application is possible, eliminating latency concerns and reducing WAN bandwidth requirements.
• Simplicity: Repeatable, easy to implement with pre-defined price.
Enabled by Cisco Locator/ID Separation Protocol (LISP)
Customer reduced the migration window by 95%
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
LISP operations Registration “Push Mode”
West-DC East-DC
X Z Y
Map Server
A B C D
LISP Site
Map
-Reg
iste
r
ETR
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
LISP Operations Resolution “Pull Mode”
West-DC East-DC
X Z Y
A B C D
LISP Site
Map-Request
Map Server
ETR
ITR
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
LISP Operations Data-plane “Connectionless tunnel = Overlay”
West-DC East-DC
X Z Y
A B C D
LISP Site
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Generic Deployment LISP with NO LAN Extension
L3 LISP tunnel
User
DC-1 DC-2
eTR eTR
iTR
1
2
3
iTR exists on User site (ie. Branch office) Redirect the end-user request to DC-2
Subnet A Subnet B
Model1
User
DC-1 DC-2
eTR eTR
PiTR
1
2
3
No iTR on User site (ie. Internet User) PTR on SP WAN intercepts request and redirect to DC-2
Subnet A Subnet B
Model 2
User
DC-1 DC-2
PxTR eTR
2
PTR on primary Site Intercepts end-User request, and redirect to DC-2
Subnet A Subnet B
3
1
Model 3
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Generic Deployment LISP with NO LAN Extension
L3 LISP tunnel
User
DC-1 DC-2
eTR eTR
iTR
2
3
iTR exists on User site (ie. Branch office) Redirect the end-user request to DC-2
Subnet A Subnet B
Model1
User
DC-1 DC-2
eTR eTR
PiTR
2
3
No iTR on User site (ie. Internet User) PTR on SP WAN intercepts request and redirect to DC-2
Subnet A Subnet B
Model 2
User
DC-1 DC-2
PxTR eTR
2
PTR on primary Site Intercepts end-User request, and redirect to DC-2
Subnet A Subnet B
3
1
Model 3
§ Simplicity of Deployment
§ Address the Server team needs
§ Start here and evolve to model 2 or 1
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
PxTR
ASR
Introduced on a “S2ck” – non-‐intrusive;
Brownfield DC
Mobility needed on 10.1.1.0/24
LISP for Data Center Migration
10.1.1.5 10.1.1.6
L3 L2
Greenfield
10.1.1.0/24 advertised to the WAN from Brownfield, no change on routing required.
WAN
LISP xTR on a s2ck Default gateway for the moved traffic (op2onal) Does not receive any traffic before the move
10.1.1.0/24
xTR MS/MR
ASR
Any VLAN and
Any STP
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.5 10.1.1.6
L3 L2
ASR
Greenfield
10.1.1.0/24
Moving a resource – what happens?
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 2.2.2.2/3.3.3.3 10.1.1.6 -> 2.2.2.2/3.3.3.3
Server Moves – “Cold” Migration
2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5
10.1.1.5
IP/ARP
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2
ASR
Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 2.2.2.2/3.3.3.3
2.2.2.2 3.3.3.3 4.4.4.4
10.1.1.5
The packet flow can be symmetric to allow Firewalls on Brownfield DC before the WAN
Packet Flow from Client to Server in Greenfield North-South Traffic after the migration
5.5.5.5 LISP-encapsulated packets
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2
ASR
Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 2.2.2.2/3.3.3.3
2.2.2.2 3.3.3.3 4.4.4.4
Packet Flow between Servers in Brownfield and Greenfield DCs West-East Intra-subnet Traffic after the migration
LISP delivers intra subnet mobility. The servers communication is routed.
10.1.1.5
5.5.5.5 LISP-encapsulated packets
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Comparison between OTV and LISP for Data Center Migration
Capability OTV LISP Comments
Non-Intrusive Insertion Yes Yes on Brownfield. In Greenfield, usually is the Default Gateway
VLAN Translation Yes Yes
Spanning-Tree Isolation Yes Yes
Share the ASR between multiple blocks No Yes LISP potentially requires less Hardware.
Broadcast Issues Protection No Yes
Support for stretched Cluster requiring Layer 2 Yes No
“Cold” migration Yes Yes
Live (“Hot”) migration Yes No
Share an ASR for OTV and LISP Yes Yes
Convergence on Router Failure ASR 3.11 up to 50 secs ASR 3.13 target below 10 sec
Up to 10 seconds N7K below 5 seconds
Route when you can, bridge when you must
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Why Layer-3 based DC Migration?
• Provides the ability to move servers between DC while keeping the same IP address and without extending the failure domain.
• It allows a routed (Layer-3) connection between the sites.
• Multiple customers mandate Layer-3 connection for long distance
• Total isolation of broadcast (Layer-2) domains between the sites.
• Also, LISP is having local significant VLAN allowing to support multiple aggregation blocks with overlapping
IP mobility without Layer 2 extension
20
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Agenda • Problem statement
• The impact of LISP on Data Center Migrations
• Technical Overview: LISP enabled on ASR 1000
• Implementation Details
• Testing Results – Scale, Latency, Convergence Time and Performance
• Conclusion
21
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Physical Connectivity
4 X ASR1002-X
PxTR-1
PxTR-2
MS/MR-1
MS/MR-2
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
HSRP active for all Vlans
HSRP Standby for all Vlans
Legacy 6500s will remain as the default-gateways for hosts
MSMRs will be the default-gateways for hosts that migrate to the new DC
using LISP
The PxTRs will use a separate HSRP group
number to what is already in use on the legacy 6500s
HSRP Configuration
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
HSRP active for all Vlans
HSRP Standby for all Vlans
MSMRs will be the default-gateways for hosts that migrate to the new DC
using LISP
The PxTRs will use a separate HSRP group
number to what is already in use on the legacy 6500s
HSRP Configuration PxTR-01 interface GigabitEthernet0/0/0.2000 encapsulation dot1Q 500 ip address 11.10.0.4 255.255.255.0 ip pim sparse-mode standby delay minimum 180 reload 300 standby 20 ip 11.10.0.6 standby 20 timers 1 3 standby 20 priority 150 standby 20 preempt standby 20 track 6 decrement 100 standby 20 track 9 decrement 100 no lisp mobility liveness test lisp mobility LISP2000 PxTR-02 interface GigabitEthernet0/0/0.2000 encapsulation dot1Q 500 ip address 11.10.0.5 255.255.255.0 ip pim sparse-mode standby 20 ip 11.10.0.6 standby 20 timers 1 3 standby 20 preempt no lisp mobility liveness test lisp mobility LISP2000
MSMR-01 interface TenGigabitEthernet0/3/0.2000 encapsulation dot1Q 2000 ip address 11.10.0.2 255.255.255.0 ip pim sparse-mode standby delay minimum 180 reload 300 standby 1 ip 11.10.0.1 standby 1 timers 1 3 standby 1 priority 150 standby 1 preempt standby 1 track 5 decrement 100 no lisp mobility liveness test lisp mobility LISP2000 MSMR-02 interface TenGigabitEthernet0/3/0.2000 encapsulation dot1Q 2000 ip address 11.10.0.3 255.255.255.0 ip pim sparse-mode standby 1 ip 11.10.0.1 standby 1 timers 1 3 standby 1 preempt no lisp mobility liveness test lisp mobility LISP2000
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Routing on ASRs
OSPF Process 1 Area 0
OSPF process 1 used only for RLOC reachability
between the ASRs
OSPF Process 1 will be used to advertise the RLOC IP addresses (loopback0) between the ASRs Completely isolated from routing on existing environment.
The MSMRs will have static default routes with the RLOC addresses of the PxTRs as the next hop. This is required for the use-PeTR function. ip route 0.0.0.0 0.0.0.0 <PxTR-1 loopback> ip route 0.0.0.0 0.0.0.0 <PxTR-2 loopback>
MSMRs use PeTR to send traffic to the PxTRs destined for non-LISP sites (WAN traffic).
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
LISP Multicast Map-Notify Messages
LISP uses multicast map-notify messages between the active and standby xTR to keep the LISP dynamic EID table in sync.
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
LISP Multicast Map-Notify Messages
- Multicast routing needs to enabled globally. - Separate Loopback interface 1 used as the RP address. - PIM sparse-mode enabled on each of the LISP mobility subnet sub-interfaces. - Each LISP mobility subnet uses a separate multicast group address for the map-notify messages. - Statically define each xTR with itself as the RP.
ip multicast-routing distributed ! interface Loopback1 description <Lo1> Multicast RP ip address 10.119.255.242 255.255.255.255 ip pim sparse-mode ! interface GigabitEthernet0/0/0.2000 encapsulation dot1Q 500 ip address 11.10.0.4 255.255.255.0 ip pim sparse-mode lisp mobility LISP2000 ! router lisp eid-table default instance-id 0 dynamic-eid LISP2000 database-mapping 11.10.0.0/24 locator-set DC1 map-notify-group 239.0.0.100 ! ip pim rp-address 10.119.255.242 override
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Detecting EIDs on the existing Data Center PxTR is not the default gateway on source DC
• LISP PxTRs need to receive a packet to detect hosts on the local segments to build up the EID table.
• Hosts have already ARP’d for the default GW, so unlikely that the PxTR will receive a packet (ARP request broadcast) from hosts in production.
• PxTRs may never learn about hosts in source DC…
28
• Use a TCL script which sends unicast pings to each IP address within the LISP mobility subnets.
• Even if the hosts do not respond to pings they will reply to the ARP that is sent by the xTR before the ping, and so the xTR will learn about the hosts on the segments.
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Detecting EIDs on the existing Data Center PxTR is not the default gateway on source DC
29
tclsh puts "Enter the subnet 1st 3 octets of subnet:" flush stdout gets stdin subnet for {set i 1} {$i <= 254} {incr i} { set var $subnet append var $i ping $var rep 2 time 1}
This script can be copied into a text editor and saved it as a .tcl file. In this example it was saved as SWEEPING.tcl. The script should then be copied onto the flash on the ASR. Note the script is only needed on the PxTR-1.
alias exec detect tclsh flash:SWEEPING.tcl An alias command can be created on the ASR.
xTR-01#detect Enter the subnet 1st 3 octets of subnet: 10.10.14. Type escape sequence to abort. Sending 2, 100-byte ICMP Echos to 10.10.14.1, timeout is 1 seconds: !! Success rate is 100 percent (2/2), round-trip min/avg/max = 1/1/1 ms Type escape sequence to abort. Sending 2, 100-byte ICMP Echos to 10.10.14.2, timeout is 1 seconds: !!
Then to run, type ‘detect’. It will prompt you to enter the 1st 3 octets of the subnet address.
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Cisco Validation Services
• Confirmed that the solution met requirements for availability, security, and reliability before implementing it in the production network.
• Vital on the success of this deployment.
• Gives customers the experience and confidence.
• Test overlap with rollout.
• Reduction of risk of introducing new technology.
Enhanced Customer Aligned Testing Services
30
http://www.cisco.com/web/services/portfolio/documents/validation-service-overview.pdf
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
HW and SW Used on the validation testing The same HW and SW that was used in production
31
Qty Part # Hardware Platform
Software Version Role
4 ASR1002-X Cisco ASR1002-X Chassis, 6 built-in GE, Dual P/S, 4GB DRAM
IOS XE 3.10.0S LISP Enabled Routers / Devices Under Test
2 WS-C6509-E 6500-E chassis 12.2(33)SXH4 New Environment Core / Non-DUT 2 WS-C6509-E 6500-E chassis 12.2(33)SXH4 New Environment Aggregation / Non-DUT 4 WS-C6509 8.5(3) Aggregation Legacy / Non-DUT
4 WS-X6K-SUP1A-2GE 1000BaseX Supervisor Supervisor used on Legacy Agg Switches
ASR 1002-X with LISP enabled was connected to End of Life Catalyst 6500 with Sup1A, which proves this solution works with any network.
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Test Results – Scale and Performance
32
Scale Parameter Number Comments
Number of subnets with LISP mobility 120 120 Tested at ECATS; 256 Supported with XE 3.10
Number of Dynamic EID (IP addresses) 2000 2000 Tested at ECATS;
5000 Supported with XE 3.10.
Performance
Platform Frame size (Byte)
Throughput (Mpps)
Throughput (Gbps)
Latency (us)
ASR1001 300 0.70 1.70 111.072
ASR1002-X 300 7.09 17.03 83.16
ASR 1006 or 1013 With RP2/ESP40
300 10.54 25.3 62.1
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
This is the latency added by the ASR on Legacy and ASR on New Data Center. It does not include the latency that may be added by the WAN link, this depends on the distance.
Latency Before and After the migration LISP on ASR adds 60 Microseconds for a migrated server = Negligible
33
Legacy <-> WAN
New <-> WAN
Legacy: Within Block
Legacy: Between
Block Legacy <->
New Within New
Server migration, diff VLANs, same block - Before 66 µs - 45 µs 55 µs 115 µs -
Server migration, diff VLANs, same block - After - 120 µs - - 115 µs 72 µs
Server migration, diff block - Before 73 µs - 45 µs 59 µs 120 µs -
Server migration, diff block - After - 123 µs - - 118 µs 39 µs
Server migration, Same VLAN - Before 55 µs - 38 µs 43µs 110 µs -
Server migration, Same VLAN - After - 118 µs - - 115 µs 55 µs
Server migration, Average - Before 64 µs - 42 µs 52 µs 115 µs -
Server migration, Average - After - 120 µs - - 116 µs 55 µs
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
The 28 seconds convergence when the 6500 Aggregation Switch on Legacy DC was powered off was caused by Spanning Tree reconvergence. Legacy DC was using Per-VLAN Spanning Tree.
Converge Times A / B : A = Convergence after failure; B = Convergence after recovery
Leg <--> WAN New <--> WAN Leg: Within Blk Leg: Between Blk Leg <--> New Within New
Router failure Tests Power Failure, Leg - Stby - - - - - - Power Failure, Leg - Act 3 sec. / - 3 sec. / - - - 3.1 sec. / - - Power Failure, New - Stby - - - - - - Power Failure, New - Act 3 sec. / - 3 sec. / - - - 6.5 sec. / - 3.3 sec. / - Reload, Leg - Stby - - - - - - Reload, Leg - Act - 0.3 Sec. / - - - - - Reload, New - Stby - - - - - - Reload, New - Act - 3 sec. / - - - 3.1 sec. / - - Sim. Crash, Leg - Act - - - - - - Sim. Crash, New - Act - - - - - - Sim. Crash, Leg- Stby - - - - - - Sim. Crash, New - Stby - - - - - - Power failure, Agg, Leg - Stby* 7.2 sec / - - 7.2 sec / * 7.2 sec / - 7.2 sec / - -
Power failure, Agg, Leg - Act* 9.7 sec. / 28 sec. 0.1 sec. / - * / * 9.7 sec. / 28 sec. 9.7 sec. / 28 sec. -
LISP Convergence below 10 seconds and faster for most cases
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2 Any VLAN
and Any STP
ASR
L3 L2 Any VLAN
and Any STP Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 4.4.4.4/5.5.5.5
2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5
10.1.1.5
All the servers for a subnet have been migrated to new DC Goal is to avoid 'trombone' of all traffic
35
LISP-encapsulated packets
HSRP Configured
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2 Any VLAN
and Any STP
ASR
L3 L2 Any VLAN
and Any STP Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 4.4.4.4/5.5.5.5
2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5
10.1.1.5
All the servers for a subnet have been migrated to new DC Step 1 – Add Agg Switches to same HSRP group as ASR
36
LISP-encapsulated packets
HSRP Configured
1. Add VLAN interface on the aggregation switch in the New DC
2. Use the same HSRP group as on ASR 1K
3. HSRP Virtual IP will be the same as on the ASR
4. Use Lower HSRP priority on Agg than the sub-interfaces on the ASR
5. Enable the vlan interfaces (no shut) and make sure they go into the HSRP listen state.
No Service Disruption
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2 Any VLAN
and Any STP
ASR
L3 L2 Any VLAN
and Any STP Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 4.4.4.4/5.5.5.5
2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5
10.1.1.5
All the servers for a subnet have been migrated to new DC Step 2 and 3 – Move the Gateway to the Agg Switches
37
LISP-encapsulated packets
HSRP Configured
1. Increase the HSRP priority of the 6500s so that they preempt the ASRs and become HSRP active and standby.
2. Remove HSRP configuration on the ASR1k’s sub-interface on New DC.
Those steps must be done in quick succession. This is to avoid traffic black holing.
No Service Disruption
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
ETR MS/MR
Brownfield DC
Mobility needed on 10.1.1.0/24
PxTR
ASR
10.1.1.6
L3 L2 Any VLAN
and Any STP
ASR
L3 L2 Any VLAN
and Any STP Greenfield
10.1.1.0/24
WAN
LISP Mapping DB
Server -> Location 10.1.1.5 -> 4.4.4.4/5.5.5.5 10.1.1.6 -> 4.4.4.4/5.5.5.5
2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5
10.1.1.5
All the servers for a subnet have been migrated to new DC Step 4 and 5 – Start advertising the subnet from New DC
38
LISP-encapsulated packets
HSRP Configured
1. Advertise the subnet to the WAN via the aggregation switches in New DC.
2. Shutdown the corresponding interface on the aggregation switches on the Legacy DC.
Those steps must be done in quick succession. If they are done within 5 seconds, then 2 seconds
of traffic interruption.
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
Key Takeaways
• Servers and Application Teams are increasingly demanding that the network allows migrations to happen with IP Preservation (no changes on the server).
• LISP running on ASR 1000 has been validated by Cisco to meet this requirement.
– It works with Any Network on Source and Destination Sites.
• Solution deployed by large outsourcing provider for a multinational insurance company and was able to reduce by 95% the migration window time required to migrate applications from one DC to another.
39
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
More Information Detailed presentation, workshop, demo, test results, training, discuss your project
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Santiago Freitas Customer Solutions Architect [email protected]
Patrice Bellagamba Distinguished Systems Engineer [email protected]
© 2014 Cisco and/or its affiliates. All rights reserved. CCSDCT-1100 Cisco Public
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