Avaya Configuring IP Services Manual do Utilizador descarregar pdf (Página 48)

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101

Configuring IP Services

2-20

Forwarded IP Datagrams

When the router receives an IP datagram that needs forwarding on a RIPSO

interface, the router compares the security classiﬁcations and authority values

speciﬁed in the security label with those conﬁgured on the outbound interface. So,

before forwarding the datagram, the router

• Checks that all RIPSO conditions are met (see above)

• Applies any outbound speciﬁc conﬁguration parameters

The router drops any datagrams that do not meet these requirements and generates

an ICMP error message.

Originated IP Datagrams

When the router originates a datagram and the following conditions are true:

• The datagram needs forwarding through a RIPSO interface

• The RIPSO interface requires outbound labels for originated datagrams

the router labels the datagram with the default security label before transmitting it.

Unlabeled IP Datagrams

If the router receives an unlabeled IP datagram from an interface on which RIPSO

is not enabled (or on which labels are not required for inbound datagrams), and

the IP datagram needs forwarding to an interface on which RIPSO is enabled and

labels are required for outbound datagrams, then the router labels the datagram

using either an implicit label or default label as follows:

• If the inbound interface has an implicit label conﬁgured, then the router uses it

to label the datagram.

• If the inbound interface does not have an implicit label conﬁgured, then the

router labels the datagram with the default label conﬁgured for the outbound

interface.

If the interface does not have an implicit or default label conﬁgured, then the

datagram is simply dropped.

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