Dell PowerConnect B-RX Configuration Manual page 1099

FIGURE 133
Configuring ACL-based inbound sFlow
The followings sections describe how to configure ACL-based Inbound sFlow:
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Configuration considerations for ACL-based inbound sFlow
Consider the following when you configure ACL-based inbound sFlow:
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BigIron RX Series Configuration Guide
53-1001986-01
sFlow packet format
Sequence Flow for sFlow Records
Packet Containing
sFlow Sample
L2
IP
UDP
sFlow
"Configuration considerations for ACL-based inbound sFlow"
"Creating an ACL with an sFlow clause"
"Specifying an sFlow collector"
sFlow must be enabled on the router.
ACL-based mirroring: The mirror and copy-sflow keywords are mutually exclusive on a per ACL
clause basis.
Port-based monitoring: Port-based monitoring and ACL-based sFlow can co-exist on the same
interface.
Port-based sFlow: Port and ACL-based sFlow can co-exist on the same interface. When both
features are configured on an interface, packets that qualify as ACL-based sFlow packets are
sent to the collector as ACL sample packets. Also, the user can configure ACL-based sFlow on
an interface without configuring port-based sFlow.
Policy Based Routing: The copy-sflow keyword is applicable for PBR ACLs.
IPv4 ACL based Rate-Limiting: When the copy-sflow keyword is used in an IPv4 Rate Limiting
ACL, only traffic permitted by the Rate Limiting engine is copied to the CPU for forwarding to the
sFlow collector.
Tag Type
Length
1
Sequence # 1
Source ID
.
.
.
Tag Type
Length
1991
.
.
.
Tag Type
Length
1
Sequence # 2
Source ID .
.
.
Tag Type
Length
1
Sequence # 3
Source ID .
.
Configuring sFlow
Detail of Foundry Proprietary Record
Tag Type
Length
1991
Length includes
Flags:
Foundry Proprietary
Group ID:
Tag Type 1991 and
Encapsulated sFlow
records
Tag Type
Length
1
Sequence # 1
Length for Encapsulated
sFlow samples only include
Encapsulated
current Seq record
sFlow sample record
Flag Values:
0x00000001 = First packet of a flow
0x00000002 = ACL-triggered sample
0x00000004 = CPU-handled packet
0x00000008 = Not counted by interface sampler
Group ID:
An arbitrary id used for grouping samples
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