VM Mobility Support
VM mobility is the ability of virtual machines to migrate between one server and another while retaining their
existing MAC and IP addresses.
The following are the two key components in EVPN Route Type 2 that enable VM Mobility:
• Host MAC advertisement component that is imported into local bridge MAC table, and Layer 2 bridged
traffic across the network overlay.
• Host IP advertisement component that is imported into the IP routing table in a symmetric IRB design,
enables routed traffic across the network overlay.
The above-mentioned components are advertised together in a single MAC + IP host route advertisement. An
additional MAC-only route could also be advertised.
The following behaviors of VM are supported. The VM can:
• retain existing MAC and acquire a new IP address
• retain existing IP address and acquire a new MAC
• retain both existing MAC and IP address
IRB solution supports VM mobility with IP+MAC pair. VM mobility move, with new IP to MAC, or new
MAC to IP, is not supported.
Note
Configuring EVPN IRB
/* Configure CEF to prefer RIB prefixes over adjacency prefixes.*/
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface Bundle-Ether 3
RP/0/RSP0/CPU0:router(config-if)# lacp system mac 1.1.1
RP/0/RSP0/CPU0:router(config-if)# exit
RP/0/RSP0/CPU0:router(config)# cef adjacency route override rib
/* Configure EVPN L3VRF per DC tenant. */
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# vrf irb1
RP/0/RSP0/CPU0:router(config-vrf)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-vrf-af)# import route-target 1000:1
RP/0/RSP0/CPU0:router(config-vrf-af)# export route-target 1000:1
RP/0/RSP0/CPU0:router(config-vrf-af)# exit
/* Configure Layer 2 attachment circuit (AC) from multichassis (MC) bundle interface, and
bridge-group virtual interface (BVI) per bridge domain. */
/* Note: When a VM migrates from one subnet to another (subnet stretching), apply the
following IRB configuration to both the EVPN PEs. *\
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
589
Configure EVPN IRB
VM Mobility Support
To Next Page
Loading...
Need help?
General
