Matching COMMUNITY with Community Lists
Cisco originally created communities as a proprietary feature, treating the 32-bit COMMUNITY as a decimal value (as shown in Example 13-11). When the COMMUNITY PA was added to the BGP standard RFC 1997, the 32-bit COMMUNITY was formatted as AA:NN, where AA is a 16- bit number to potentially represent an ASN, and NN represents a value as set by that ASN. However, the COMMUNITY PA remained a 32-bit number. Cisco routers can use either the original format or the RFC 1997 forma..
OSPF network types can be described as either RFC-compliant or Cisco proprietary, as follows: • RFC-compliant— RFC-compliance offers a vendor-neutral routing platform. There are two nonbroadcast OSPF network types (RFC 2328): o NBMA o Point-to-multipoint • Cisco-specific— Of the broadcast, point-to-multipoint (broadcast), point-tomultipoint nonbroadcast, point-to-point, and NBMA OSPF network type options on a Cisco router that can be used in ..
Configuring Shaping by Bandwidth Percent
The shape command allows the shaping rate to be stated as a percentage of the setting of the interface or subinterface bandwidth setting. Configuring based on a simple percentage of the bandwidth command setting seems obvious at first. However, you should keep in mind the following facts when configuring the shape command based on percentage of interface bandwidth: ■ The shape percent command uses the bandwidth of the interface or subinterface under which it is enabled. ..
Extracting Router Information via SNMP Tools
To extract router information via SNMP, we will use the suite of SNMP tools provided with the NET-SNMP toolkit. Use snmpget to extract a single MIB object from the router's MIB tree. This example uses snmpget to extract the router's system contact information: freebsd% snmpget v1 c ORARO Router .1.3.6.1.2.1.1.4.0 system.sysContact.0 = Helpdesk 800-555-2992 Use snmpset to alter MIB objects within the router's MIB tree. The next example demonstrates how to modify MIB va..
SDLC is a serial protocol that is commonly used for SNA devices. It is extremely popular in financial environments for devices such as banking machines, card readers, and account printers. Using SDLC in conjunction with DLSw is becoming increasingly common in these sorts of situations. This allows the remote SDLC devices to communicate with the Token Ring Interface Coupler (TIC) on a mainframe computer through an IP network. There is a huge advantage to this because it means ..
