You can use MLS with your existing chassis and modules. When the Layer 3-switching entry for a flow ages out, the flow statistics can be exported to a flow collector application. Packets that do not have a partial or complete switched path to reach their destinations still use routers for forwarding packets. The MMLS-SE uses this list to determine on which VLANs traffic to a given multicast flow should be replicated. Before release 12.0(2), input access lists were not compatible with MLS.Enabling IP accounting on an IP-MLS-enabled interface disables the IP accounting functions on that interface.IP MLS is disabled on an interface when the data encryption feature is configured on the interface.
By providing multiple security levels, MLS enables you to set up rules and control traffic based on IP addresses and transport-layer application port numbers.
IP multicast MLS switches IP multicast data packet flows between IP subnets using advanced, ASIC switching hardware, thereby off loading processor-intensive, multicast packet routing from network routers. The MLS-SE then checks the MLS cache and finds the entry matching the flow in question. The basic topology consists of a switch and an internal or external router connected through an ISL or 802.1Q trunk link. Figure 5 Basic IP Multicast MLS Network Topology The MLS cache contains flow information for all active multilayer switched flows.
All rights reserved. The MLS-SE maintains a cache for IPX MLS flows and maintains statistics for each flow. MLS allows you to enforce access lists on every packet of the flow without compromising MLS performance. A flow is a unidirectional sequence of packets between a particular source and destination that share the same protocol and transport-layer information. The MLS-SE handles permit traffic supported by MLS at wire speed. You can configure the aging time for IPX MLS entries kept in the MLS cache. A multilayer switch is a computer networking device that switches on OSI layer 2 like an ordinary network switch and provides extra functions on higher OSI layers. The packet forwarding function is moved onto Layer 3 Cisco series switches whenever a partial or complete switched path exists between two hosts. No MLS configuration is required on the Supervisor Command Language Interpreter (CLI) or the routing module. Multiprotocol Label Switching (MPLS) is a protocol for speeding up and shaping network traffic flows. You do not need to centralize servers in multiple VLANs to get direct connections.
The MLS-SE considers this packet an If it detects more than one mask, it changes to the most specific mask and purges the entire MLS cache. Layer 3 protocols, such as IP and Internetwork Packet Exchange (IPX), are connectionless—they deliver each packet independently of each other.
Communication flows from a client to a server and from the server to the client are distinct. The result is a rewritten IP multicast packet that appears to have been routed by the router. The router and switch exchange information using the multicast MLSP.
Similarly, a separate IPX MLS entry is created in the MLS cache for the traffic from Host A to Host C, and for the traffic from Host C to Host A. Similarly, when the MLS-RP detects a routing topology change, the appropriate MLS cache entries are deleted in the MLS-SE.
After the MLS cache is created, packets identified as belonging to an existing flow can be Layer 3 switched.
Table 3 Layer 3-Switched Multicast Packet Header with Rewrite Flows are based on the IP address of the source device and the destination IP multicast group address. An IPX MLS cache entry is created for the initial packet of each flow.
By deploying MLS, you gain the benefits of both switching and routing on the same platform. It allows you to configure and enforce access control rules on the RSM.
MLS is disabled on an interface when Network Address Translation (NAT) is configured on the interface. Table 2 Layer 3-Switched Multicast Packet Header In each of these topologies, the source traffic is received on the switch, traverses a trunk link to the router, and returns to the switch over the same trunk link to reach the destination group members. When there is an extended access list is on any of the MLS-RP interfaces, the mode is ip-flow (the most specific).
After the MLS cache is populated, multicast packets identified as belonging to an existing flow can be Layer 3 switched based on the cache entry for that flow. Introduction to MLS Layer 3 protocols, such as IP and Internetwork Packet Exchange (IPX), are connectionless—they deliver each packet independently of each other. The MLS-SE immediately enforces security for the affected flow by purging it. IPX data packet flows are switched between networks, off loading processor-intensive packet routing from network routers. The MLS cache maintains flow information for all active flows. Provides a simple feature-card upgrade on the Catalyst 5000 series switches.
When using an external router, follow these guidelines:
Enabling IP accounting on an MLS-enabled interface disables the IP accounting functions on that interface.
The resultant packet format and protocol behavior is identical to that of a packet that is routed by the RSM or external Cisco router. MLS uses NetFlow Data Export (NDE) to export the flow statistics Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on short path labels rather than long network addresses, thus avoiding complex lookups in a routing table and speeding traffic flows.
The MLS-SE rewrites the switched Layer 3 packets so that they appear to have been routed by a router. The cache contains traffic statistics entries that are updated in tandem with packet switching. When there is a standard access list is on any of the MLS-RP interfaces, the mode is source-destination-ip. Access lists impact the flow mask advertised by an MLS-RP. Each entry is of the form {source IP, destination group IP, source VLAN}. The MLS cache maintains flow information for all active flows. The MLS-SE supports only the most specific flow mask for its MLS-RPs. If the MLS-RP is configured with an access list to deny access from Station A to Station B, the MLS-RP receives the packet, checks its access list permissions to learn if the packet flow is permitted, and then discards the packet. This document covers only IP MLS.
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