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MAC address for IRB interfaces in both the primary and secondary PE This feature allows you to configure the same
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Must change their Address Resolution Protocol (ARP) for IRB’s The hosts connected to the customer edge (CE) router Provider edge (PE) router to a secondary PE router, the MAC address In case of VPLS multihoming, if there is a failover of the primary Of traffic between two VLANs on the same switch. MAC addresses for different VLANs, which facilitates the exchange This new feature allows you to configure distinct Of an IRB logical interface was the same for both VLANs, the firewallĭropped the traffic. VLAN tag is changed to communicate with the host on the other VLAN.īefore the introduction of this feature, if the MAC address To go through the firewall to the host on the other VLAN, then the When both VLANs are on the same subnet and traffic from one VLAN needs The use of a transparent firewall between two VLANs on the same switch. The packets with the router’s LayerĢ virtual MAC address, which is manually configured, are switchedĬonfiguring a MAC address of an IRB logical interface allows Packets that arrive on an interface of theīridge domain are either switched or routed, based on the destination Support for simultaneous Layer 2 bridging and Layer 3 routing within I know in theory that it should be possible to filter a monitor session with an access list, but I tried that on a quieter VLAN and it did not seem to work when the source was a VLAN.Junos OS Release 13.2 and later support the assignment of MACĪddresses to IRB logical interfaces. If I do that, I want to absolutely sure that the monitoring process is non-blocking.Ĭan anyone answer that please? Is it safe to monitor source a vlan that has 250 Mbps running through it when the monitor destination has only 100 Mbps?Īlternatively, is it possible to span monitor the layer-3 vlan interface only? I am reluctant to do that because the VLAN is carrying an aggregate of about 250 Mbps through this switch, and the monitor port is only 100 Mbps. The alternative is to span the whole VLAN to a monitor port, and use the capture filter on the sniffer. So I don't think there are any broadcasts to be sniffed, so I am not getting anywhere with the access port.
#Ask router for mac address config Pc
Therefore, the PC knows the router MAC address from its ARP on the legitimate side of the network. What I suspect is that these packets are originating on some PC that has two NICs in it, one on the VLAN, and the other on a rogue network, and that the PC has bridging enabled on it. So that makes me wonder where the rogue machine got the router MAC address from. That tells me that these packets were MAC-unicast to the router. I tried setting a sniffer on an access port on the VLAN, but I received nothing from the rogue address, even when the "router" was telling me that it had seen packets hitting the access list. There are two ways I can sniff the VLAN: I could connected the sniffer to an access port on the VLAN, or I can set up a span monitor on the VLAN. It should be simple to find the MAC address, but I don't know how.īTW, it is not practicable to snoop the whole VLAN because the volume of traffic through this switch is enormous, and the rogue packets are quite infrequent.Ĭan anyone tell me if there is any way to log the MAC address of a packet that hits a "deny" on an IP access list? I tried setting a host route for that address to that VLAN, but that did not work they are not answering even an ARP request to the rogue IP address. So, now that I have packets hitting the "deny", and being logged, how can I find their source MAC address so I can trace them through the switches? They are not in the ARP cache because the "router" is not expecting to find them on that VLAN, and so never ARPs for them there. I have used access lists to implement a sort of reverse-path check on some VLANs, so that if the switch sees packet sourced from an IP address that I do not expect to find on the VLAN, then it is denied. I have a 4506 switch with a number of VLANs.
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This sounds as if it should be simple, but it is giving me problems.