Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 47)

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Configuring IP Routers and Interfaces

2-19

• Whether datagrams received or transmitted on this interface should have their

labels stripped

You also specify whether the router creates the following types of labels:

• An implicit label, which the router uses to label unlabeled inbound datagrams,

when required

• A default label, which the router uses to label unlabeled outbound datagrams,

when required

• An error label, which the router uses to label ICMP error messages associated

with processing security options

The following sections describe how the router uses this information to handle

labeled IP trafﬁc.

Inbound IP Datagrams

When the router receives an IP datagram on a RIPSO interface, it compares the

security classiﬁcation and authority values speciﬁed in the security label with

those conﬁgured on the inbound interface.

If the interface does not require a security label for inbound IP datagrams, then the

router accepts both unlabeled IP datagrams and datagrams that meet the

classiﬁcation and authority rules described in the next paragraph.

If the interface does require a security label, then for the router to accept the

datagram, the following RISPO conditions must be met:

• The datagram must be labeled.

• The security classiﬁcation value in the datagram’s label must be within the

security-level range conﬁgured for the interface.

• The authority ﬂags in the datagram’s label must include all of the ﬂags

required for the interface and cannot contain any ﬂags not allowed for the

interface.

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

an ICMP error message.

On a non-RIPSO interface, the router only accepts unlabeled IP datagrams and IP

datagrams that are labeled as Unclassiﬁed with no authority ﬂags set.

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