Routing over vpls components – Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Overview
7
Routing over VPLS components
VE interface
VE interfaces can switch or route packets. This is decided by the destination L2 (Ethernet) MAC of
the packet received at the VPLS end-point. When the Ethernet MAC is the Port MAC or Router MAC,
the packet is routed.
Routing
This is the IP interface of the VE, which supports most of the existing functionalities of a legacy IP
interface or the VE over VLAN interface.
•
When the VE interface is disabled, all the routed packets to the interface are dropped.
•
When the VE interface is not configured over a VPLS instance, all the routed traffic to the
interface is L2 forwarded by VPLS. This ensures that it does not break the existing routing by
way of loopback connections which may already be configured.
Switching
The VPLS L2 switching functionality remains unchanged. Refer to
745 for specific protocol support.
ARP
ARP maintains the relation between the L2-MAC to IP address. The VE over VPLS ARP maintains the
same behavior.
•
The ARP entries associated with VE over VPLS interface is resolved on one of the members of
the VPLS instances, either local or remote-end point (remote VPLS peer)
•
The ARP broadcast goes out through each of the end-point members of the VPLS instance
•
Static ARP entries pointing to the VE over VPLS end-points is supported
ARP DAI
ARP DAI is not supported on the VE over VPLS ARP entries. The ports and VLANs associated with a
VPLS instance are assumed to be always "trusted".
Re-ARP
When a resolved end-point or remote-peer for an ARP entry goes down, all the ARP entries pointing
to that entity are flushed. Any further traffic to the remote host triggers a re-arp so that the ARP is
resolved against the current active member from which the remote host could be reached.
•
proxy-arp is supported
•
Local-proxy-arp is not supported
Unicast routing
VE over VPLS routing is only supported on the default-VRF. Routing is supported between various
endpoints (remote & local) of a VPLS-VE instance and other non-VPLS based IP interfaces. All the IP
interfaces must be in default-VRF.
•
Supported unicast routing: