MPLS over Tunnel GRE (S6720)

Created: Jul 25, 2019 20:07:29Latest reply: Jul 29, 2019 07:21:48 302 3 0 0
  Rewarded Hi-coins: 0 (problem resolved)

Hello.

I´ve 2 Switchs S6720, having trouble to use MPLS over a GRE Tunnel

I´ve a primary circuit over a L2, working mpls as it should do. (no problem)

But I´ve a second circuit with a public IP in both sides.

I´d like to know if it is possible to create a Tunnel GRE using my public IPs and put it to work witch MPLS.

I´ve tried it, but its nok working, maybe a MTU problem?

Does anybody have this scenario?


Best Regards.

Rodrigo

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Featured Answers
chenhui
Admin Created Jul 26, 2019 02:30:23 Helpful(0) Helpful(0)

@browmano Hi,
The MPLS could work with GRE tunnel.
Would you please provide the corresponding configuration.
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All Answers
wissal
wissal MVE Created Jul 25, 2019 21:19:57 Helpful(0) Helpful(0)

Hi,

Please find below Ethernet over GRE

Generic Routing Encapsulation (GRE) provides a mechanism to encapsulate packets of a protocol into packets of another protocol. This allows packets to be transmitted over heterogeneous networks. A channel for transmitting heterogeneous packets is called a tunnel.

In Figure 1-3, the enterprise headquarters and branch use Ethernet networks and are connected by an IP/MPLS backbone network. Ethernet over GRE can be deployed to transparently transmit Ethernet packets over a GRE tunnel, enabling Layer 2 communication between the enterprise headquarters and branch.

Figure 1-3  Ethernet over GRE networking 
imgDownload?uuid=711390c8e5c54b2683c2748

Ethernet over GRE encapsulates Ethernet packets using GRE and transmits the encapsulated packets over a network running another network layer protocol, such as IPv4. The detailed working process is as follows:

  1. User-side physical Ethernet interface GE0/0/2 on SwitchA receives an Ethernet packet containing a VLAN tag from the branch network.
  2. SwitchA performs Layer 2 forwarding within the device based on the MAC address and VLAN tag and finds the outbound interface VE0/0/1.
  3. VE0/0/1 on SwitchA processes the Ethernet packet and forwards the packet to Tunnel 1 bound to it. Tunnel 1 encapsulates the Ethernet packet using GRE (with the protocol code 0x6558) and forwards the encapsulated packet to SwitchB over a GRE tunnel.
  4. Tunnel 1 on SwitchB decapsulates the received packet using GRE, finds that the protocol code is 0x6558, and forwards the decapsulated Ethernet packet to VE0/0/1 bound to Tunnel 1.
  5. After the decapsulated Ethernet packet reaches VE0/0/1 of SwitchB, SwitchB performs Layer 2 forwarding within the device based on the MAC address and VLAN, and finds the outbound interface GE0/0/2.
  6. SwitchB sends the Ethernet packet to the headquarters network through the outbound interface GE0/0/2.
imgDownload?uuid=08b4369ef0b3416991baef9 NOTE:

As a Layer 2 tunnel, Ethernet over GRE can only forward unicast and broadcast packets of a specified VLAN but not multicast packets.

For more details please refer the link:

https://support.huawei.com/enterprise/en/doc/EDOC1100065685/7b0ce5bc/ethernet-over-gre

Thanks

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Telecommunications%20engineer%2C%20currently%20senior%20project%20manager%20at%20an%20operator%2C%20partner%20of%20Huawei%2C%20in%20the%20radio%20access%20network%20department%2C%20for%2020%20years%20I%20managed%20several%20types%20of%20projects%2C%20for%20the%20different%20nodes%20of%20the%20network.
chenhui
chenhui Admin Created Jul 26, 2019 02:30:23 Helpful(0) Helpful(0)

@browmano Hi,
The MPLS could work with GRE tunnel.
Would you please provide the corresponding configuration.
  • x
  • convention:

WheatGrass
WheatGrass Created Jul 29, 2019 07:21:48 Helpful(0) Helpful(0)

  • x
  • convention:

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