Zhone Technologies Network Device manual Internet Protocol Router, Maximum Byte Size, Snmp Support

Zhone Technologies, Inc. IMACS Product Book, Version 4

6. Internet Protocol Router

Internet Protocol Router: 883060 (10Base2) and 883160 (10BaseT)

Introduction:

IPR is an IP router server card that runs on the ACS hardware. It therefore must be inserted in one of the P slots of the Zhone Technologies IMACS concentrator. IPR uses 68360 communication controller and has 4 MB of DRAM. To use the IPR card, one must use host version 5.0. The IPR has 4 interfaces: 1 Ethernet 10Base-T or 10Base-2 LAN interface and 3 Frame Relay WAN interfaces (ports). Ethernet interface supports 10Mbits/sec and 3 Frame Relay interfaces together support 2 * T1/E1 access speed. IPR card has no Munich ports. Frame Relay ports can be connected through HSU or WAN cards. IPR is an IP router. This means that IPR forwards (routes) packets based on IP destination address, as opposed to FRS, that forwards packets based on a Frame Relay data link (dlci) address.

IPR routes IP datagrams (packets) between Ethernet and Frame Relay PVCs. Frame Relay PVCs can be associated with any of the 3 Frame Relay ports. (use of Ethernet is not mandatory, IPR can easily route just between Frame Relay PVCs). The maximum number of PVCs supported is 128. IPR also has provisions to automatically forward IP packets to and from the host (CPU) IP node of the IMACS box that IPR resides in. It automatically takes care of all the IP fragmentation to and from the host (CPU) IP node.

In addition to routing, IPR v2.0 is capable to bridge packets between Ethernet and Frame Relay bridge PVCs, and between Frame Relay bridge PVCs. IPR will forward packets matching an entry in the MAC addresses table, configured manually by the user. LAN broadcasts are being forwarded to all bridge PVCs. Because no spanning tree or learning algorithm is supported and to avoid loops, there should be no more than one physical connection between the same nodes. The maximum number of MAC addresses supported is 9. The maximum number of bridge PVCs supported is 9. Bridging function is enabled on host version 5.1.

IPR(s) can also be (optionally) connected to FRS server card (on the same IMACS), giving the customer an option of concentrating Ethernet traffic in addition to other ports of concentration on the FRS card (this is called an EtherFrad mode). This connection is possible from IPR port C1 only and is subject to bus allocation conflicts due to hardware limitation of the ACS card.

Maximum Byte Size:

The maximum number of bytes that an IPR can handle in a single packet is 1528 bytes (this is regardless whether a packet arrives from Ethernet or Frame Relay interface).

SNMP Support:

IPR has SNMP support for MIB 2, as well as SNMP support for Zhone Technologies Private MIB. IPR has a testing/debugging “on-the-fly” support, which includes displaying Routing table, displaying and clearing ARP table, displaying and clearing IP statistics, displaying and clearing PVC statistics in 15 minutes intervals for the last 96 intervals, displaying and clearing frame relay port statistics in 15 minutes intervals for the last 96 intervals, displaying and clearing LMI statistics, displaying and clearing Ethernet statistics.

Standards Support:

•IPR uses a standard encapsulation of IP over Frame Relay (RFC 1490).

•IPR supports RIP (Routing Information Protocol, RFC 1058) for dynamically discovering IP routes from the adjacent IP routers on Frame Relay or Ethernet. IPR also supports static routes.

•IPR supports a DCE side of the Inverse ARP Protocol (RFC 1293).

•IPR can use different LMI encapsulations: ANSI, CCITT or LMI (Gang of Four). Each Frame Relay Port can be configured as either U-DTE, U-DCE, or NNI type.

•IPR supports Motorola LAPD packet forwarding protocol.

March 2001 Page 92