Routing
Routing

Same IP address for 2 or more PEs

a month ago

IT is possible to configure more than one MX to behave like in the scenario described in the link:

 

https://community.cisco.com/t5/mpls/same-ip-addresses-in-different-pes/td-p/823863

 

Regards.

3 REPLIES 3
Routing
Solution
Accepted by topic author rocketfkinscience
a month ago

Re: Same IP address for 2 or more PEs

a month ago

Hello,

Yes, this is supported.

You need to use LDP egress-policy to filter these IP from LDP

https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/egress-po...

BUT - DON'T make this shared IP the router-id, use some other unique IP for router-id role.

HTH

Thx
Alex

_____________________________________________________________________

Please ask Your Juniper account team about Juniper Professional Services offerings.
Juniper PS can design, test & build the network/part of the network as per Your requirements

+++++++++++++++++++++++++++++++++++++++++++++

Accept as Solution = cool !
Accept as Solution+Kudo = You are a Star !
Routing

Re: Same IP address for 2 or more PEs

a month ago

hello, thank you for your answer.

If i will not apply the egress-policy will the conexion still work, will there be log messages ?

 

regards.

Routing

Re: Same IP address for 2 or more PEs

a month ago

Hello,

 


@rocketfkinscience wrote:

hello, thank you for your answer.

If i will not apply the egress-policy will the conexion still work, will there be log messages ?

Please define what do You mean by "conexion" (presumably "connection").

If You mean TCP session towards this shared address then yes, it will work but the TCP client won't get to choose where it is connecting to: it will be always connecting to the closest node with that anycast IP.

The best practice is to have 2 IP addresses on lo0.0: one unique which also serves as router-id, and second shared/anycast, which is only redistributed into IGP since MPLS anycast is quite rare technology and really is developed in the context of Segment Routing.

If You have a mixed network with CSCO routers, then JUNOS egress policy is pretty much required to avoid the messages cited in CSCO support forums link.

HTH

Thx

Alex

 

 

_____________________________________________________________________

Please ask Your Juniper account team about Juniper Professional Services offerings.
Juniper PS can design, test & build the network/part of the network as per Your requirements

+++++++++++++++++++++++++++++++++++++++++++++

Accept as Solution = cool !
Accept as Solution+Kudo = You are a Star !