MAC learning : Enabled MAC statistics : Disabled MAC limit Count : 16383.
show l2vpn forwarding bridge-domain mac-address location 0/x/CPU0.
We have a server with multiple mac addresses and we need to know what MAC is being learned by what interface. If a limit has not been configured, this is a finding.Ĭonfigure a MAC address learning limit for each VPLS bridge domain. SRX branch cannot learn MAC address from local VPLS network when global mode is switching. Solved: Im trying to find a Mac Address in the ASR9k table. Review the PE router configuration to determine if a MAC address limit has been set for each VPLS bridge domain. Juniper Router RTR Security Technical Implementation Guide Hence, it is essential that a limit is established to control the number of MAC addresses that will be learned and recorded into the forwarding table for each bridge domain. Older, valid MAC addresses would be removed from the table, and traffic sent to them would have to be flooded until the storm threshold limit is reached. The PE router receiving this traffic would try to learn every new MAC address and would quickly run out of space for the VFI forwarding table. This frees space in the table, allowing new entries to be added. Unused MAC addresses are removed from the MAC address table automatically. If the MAC table limit is reached, new addresses can no longer be added to the table. Ethernet frames sent to broadcast and unknown destination addresses must be flooded out to all interfaces for the bridge domain hence, a PE router must replicate packets across both attachment circuits and pseudowires.Ī malicious attacker residing in a customer network could launch a source MAC address spoofing attack by flooding packets to a valid unicast destination, each with a different MAC source address. The minimum you can configure is 16 addresses, and the maximum is 1,048,575 addresses. Frames are forwarded to the appropriate pseudowire or attachment circuit according to the forwarding table entry for the destination MAC address. When a frame arrives on a bridge port (pseudowire or attachment circuit) and the source MAC address is unknown to the receiving PE router, the source MAC address is associated with the pseudowire or attachment circuit and the forwarding table is updated accordingly. VLAN IDs have not been taken intoconsideration while learning.Thevlan-id all. Each MAC forwarding table instance is interconnected using domain-specific LSPs, thereby maintaining privacy and logical separation between each VPLS domain. Learning so far has been performed solely based on received source MAC addresses. A pseudowire contains two unidirectional label-switched paths (LSP). A pseudowire is a virtual bidirectional connection between two attachment circuits (virtual connections between PE and CE routers). Customer Layer 2 frames are forwarded across the MPLS core via pseudowires using IEEE 802.1q Ethernet bridging principles. VPLS defines an architecture that delivers Ethernet multipoint services over an MPLS network.