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IPv6 HSRP on IOS XR ASR9000

tmikelson
Level 1
Level 1

Just double-checking the definitions of "address linklocal" and "address global" with regards to HSRP config on IOS XR ASR9000.
Hoping this is as simple as it gets.

Scenario:

Router_A interface BVI400 IPv6 address: XXXX:YYYY:Z:Z::2/64

Router_B interface BVI400 IPv6 address: XXXX:YYYY:Z:Z::3/64

Virtual IPv6 gateway address: XXXX:YYYY:Z:Z::1/64

router hsrp
interface BVI400
address-family ipv6
hsrp 10
address linklocal autoconfig
address global XXXX:YYYY:Z:Z::1

 

1 Accepted Solution

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Hi @tmikelson ,

Yes, the configuration looks good.

The result is that HSRPv6 will create a virtual link local address (LLA) deriving the last 64 bits using the eui64 algorithm with the virtual mac address as the input. It will then couple that virtual link local address with the virtual mac address, so whichever hsrp router is the primary will respond to any traffic destined to that address. But more importantly, the virtual LLA will be used as the source address for the router advertisement (RA) messages, which will cause the host to install the default route with that virtual LLA as the next hop.

For the global address, it will use the address XXXX:YYYY:Z:Z::1 and couple it with the virtual mac address, so whichever hsrp router is the primary will respond to any traffic destined to that address.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

1 Reply 1

Harold Ritter
Cisco Employee
Cisco Employee

Hi @tmikelson ,

Yes, the configuration looks good.

The result is that HSRPv6 will create a virtual link local address (LLA) deriving the last 64 bits using the eui64 algorithm with the virtual mac address as the input. It will then couple that virtual link local address with the virtual mac address, so whichever hsrp router is the primary will respond to any traffic destined to that address. But more importantly, the virtual LLA will be used as the source address for the router advertisement (RA) messages, which will cause the host to install the default route with that virtual LLA as the next hop.

For the global address, it will use the address XXXX:YYYY:Z:Z::1 and couple it with the virtual mac address, so whichever hsrp router is the primary will respond to any traffic destined to that address.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México