Forming the Aggregate Based on a Subset of Specific Routes
Having control over which individual prefixes form the aggregate is very useful in determining which attributes the aggregate will carry. In the previous section, if you could exclude prefix 192.68.11.0/24 from being part of the prefixes that form the aggregate, the aggregate would not inherit the no-export community attribute. The advertise map is yet another form of a route map that lets you form the aggregated route based on a limited selection of the more-specific routes...
The SNMPv1 and SNMPv2 protocol messages (RFC 3416) define how a manager and agent, or even two managers, can communicate information. For instance, a manager can use three different messages to get MIB variable data from agents, with an SNMP Response message returned by the agent to the manager supplying the MIB data. SNMP uses UDP exclusively for transport, using the SNMP Response message to both acknowledge receipt of other protocol messages and supply SNMP information. Ta..
Frame Relay Data Link Connection Identifiers
To connect two DTEs, an FR service uses a virtual circuit (VC) between pairs of routers. A router can then send an FR frame with the appropriate (typically) 10-bit Data Link Connection Identifier(DLCI) header field that identifies each VC. The intermediary FR switches forward the frame based on its DLCI, until the frame eventually exits the FR service out the access link to the router on the other end of the VC. FR DLCIs are locally significant, meaning that a particular DLC..
Technical Overview of Cisco IOS Frame Relay Compression Schemes
This section introduces the different compression schemes for Frame Relay that are supported by the Cisco IOS software. In general, users select a compression scheme that falls under either the payload compression scheme or packet header compression scheme. Data Payload Compression Schemes The Cisco IOS software supports a packet-by-packet payload compression scheme using Stacker compression. The Cisco packet-by-packet payload compression for Frame Relay feature..
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Frame Relay relays or forwards frames from the source to the destination through a Frame Relay network on virtual path connections. These virtual paths can be either permanent virtual circuits (PVCs) or switched virtual circuits (SVCs). A PVC, as its name implies, is a permanent virtual connection. It is usually set up by the ca..
