Several GRE sub-interfaces over one Main GRE interface and each one of them are created over same Source Interface(Same IP address you say) towards different Destination IP address. These destinations are reachable via different Routing-Instances(Not the Default Routing Instances )This is not how interfaces and sub-interfaces work.
The interface level is the physical media shared by all resources configured under it.
The sub-interface is where the resources like an ip address, ethernet encapsulation or mpls encapsulation occurs.
It is NOT possible to configured a sub-interface underneath another one.
There is only this one level of hierarchy on the interface.
You cannot configure the same ip address on multiple sub-interfaces in the same router, this will fail the commit checks.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home------------------------------
Original Message:
Sent: 01-04-2021 00:04
From: Ali Soltan
Subject: Some Questions regarding GRE Tunnel on M960
Hi
Thank you for the answer. I have still concern about this scenario. Can we configure multiple sub-interfaces GRE in this manner:
Several GRE sub-interfaces over one Main GRE interface and each one of them are created over same Source Interface(Same IP address you say) towards different Destination IP address. These destinations are reachable via different Routing-Instances(Not the Default Routing Instances )
I will be honored if you answer this question
Thank you
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Ali Soltan
Original Message:
Sent: 01-03-2021 10:47
From: STEVE PULUKA
Subject: Some Questions regarding GRE Tunnel on M960
Yes, sub-interfaces on the gre can be configured with all the same options as other interfaces. So you can change subnets, routing instances and any other options like CoS or filters too.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
Original Message:
Sent: 01-02-2021 13:06
From: Ali Soltan
Subject: Some Questions regarding GRE Tunnel on M960
Hi
Thank you for the answer.
About sub-interfaces. Can we use different ip source and ip destination or even routing instance for GRE on each sub-interfaces?
In this method practically we can have many GRE TUNNELS
Thank you
Alireza
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Ali Soltan
Original Message:
Sent: 01-02-2021 12:20
From: STEVE PULUKA
Subject: Some Questions regarding GRE Tunnel on M960
The use of the fabric and allocation of size can not be controlled or configured. Your only choice is which card will host the tunnel interfaces.
The general recommendation is that the tunnel interfaces be hosted on one of the physical cards where the ingress or egress of the tunnel traffic will transit. This offers the most efficient use of the fabric.
You create sub-interfaces on tunnel interfaces with the same method you do on any of the physical interfaces. Simply create the multiple unit numbers and the family for the interface with the assigned addresses.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
Original Message:
Sent: 12-25-2020 23:33
From: Ali Soltan
Subject: Some Questions regarding GRE Tunnel on M960
Hi
Based on what I found on Documentations, there is no dedicated MPC/PIC for GRE tunnel(Same as the one on M Series) GRE tunnel will use Fabric Channel of the card.
Now Consider this scenario:
1- We have a MPC10-C Card which has 2x500Gbps Fabric. If I configure GRE tunnel on this card By default one fabric is used for GRE tunnel right?
2- Can we limit this allocation of Fabric to for example 100Gbps?
3- Should we use a physical port on the card which fabric is allocated for underlying link of GRE? I mean Can we connect the link to underlying network(Which GRE is configured up on it) to one card and Assign the Fabric From another card?
4- Consider we need to have about 10xGRE connections. (I asked this before and Answer is using "Sub-Interfaces") I want to know can be configure GRE sub-interfaces with different source and destination?
Thank you
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Alireza Soltanian
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