es.tid.ospf.ospfv2.lsa.tlv

Class RouterAddressTLV

java.lang.Object

es.tid.ospf.ospfv2.lsa.tlv.OSPFTLV

es.tid.ospf.ospfv2.lsa.tlv.RouterAddressTLV

public class RouterAddressTLV
extends OSPFTLV

Router Address TLV from RFC 3630 2.4.1. Router Address TLV The Router Address TLV specifies a stable IP address of the advertising router that is always reachable if there is any connectivity to it; this is typically implemented as a "loopback address". The key attribute is that the address does not become unusable if an interface is down. In other protocols, this is known as the "router ID," but for obvious reasons this nomenclature is avoided here. If a router advertises BGP routes with the BGP next hop attribute set to the BGP router ID, then the Router Address SHOULD be the same as the BGP router ID. If IS-IS is also active in the domain, this address can also be used to compute the mapping between the OSPF and IS-IS topologies. For example, suppose a router R is advertising both IS-IS and OSPF Traffic Engineering LSAs, and suppose further that some router S is building a single Traffic Engineering Database (TED) based on both IS-IS and OSPF TE information. R may then appear as two separate nodes in S's TED. However, if both the IS-IS and OSPF LSAs generated by R contain the same Router Address, then S can determine that the IS-IS TE LSA and the OSPF TE LSA from R are indeed from a single router. The router address TLV is type 1, has a length of 4, and a value that is the four octet IP address. It must appear in exactly one Traffic Engineering LSA originated by a router.

Field Summary

Fields inherited from class es.tid.ospf.ospfv2.lsa.tlv.OSPFTLV

log, tlv_bytes, TLVType, TotalTLVLength

Constructor Summary

Constructors

Constructor and Description
RouterAddressTLV() Use the constructor to create a new Router Address TLV from scratch Fill the fields, and later call encode
RouterAddressTLV(byte[] bytes, int offset) Use this constructor to create and decode

Method Summary

Modifier and Type	Method and Description
void	encode()
Inet4Address	getRouterAddress()
void	setRouterAddress(Inet4Address routerAddress)
String	toString() String representation of the RouterAddressTLV

Methods inherited from class es.tid.ospf.ospfv2.lsa.tlv.OSPFTLV

encodeHeader, getTlv_bytes, getTLVLength, getTLVType, getTLVValueLength, getTotalTLVLength, getTotalTLVLength, getType, setTlv_bytes, setTLVType, setTLVValueLength

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RouterAddressTLV

public RouterAddressTLV()

Use the constructor to create a new Router Address TLV from scratch Fill the fields, and later call encode

RouterAddressTLV

public RouterAddressTLV(byte[] bytes,
                        int offset)
                 throws MalformedOSPFTLVException

Use this constructor to create and decode

Parameters:

bytes -

offset -

Throws:

MalformedOSPFTLVException

Method Detail

encode

public void encode()

Specified by:

encode in class OSPFTLV

getRouterAddress

public Inet4Address getRouterAddress()

setRouterAddress

public void setRouterAddress(Inet4Address routerAddress)

toString

public String toString()

String representation of the RouterAddressTLV

Overrides:

toString in class Object