Mirror Services
7750 SR OS Services Guide Page 1301
ATM Mirroring
ATM mirror functionality allows 7750 SR users to mirror AAL5 packets from a source ATM SAP
to a destination ATM SAP connected locally or remotely. This functionality can be used to
monitor the ATM traffic on a particular ATM SAP. In both the local and remote scenarios the
source and destination SAPs must be of ATM SAP type.
All ingress and egress AAL5 traffic at the source ATM SAP is duplicated and sent toward the
destination ATM SAP. Mirroring the ingress traffic only, egress traffic only, or both, can be
configured. ATM OAM traffic is not mirrored toward the destination ATM SAP.
ATM mirroring is applicable to the following services using an ATM SAP:
• Layer 3: IES and VPRN
• Layer 2: Apipe (sdu-type only), Ipipe, EPipe, VPLS
IP filters used as a mirror source are supported on ATM SAPs based on the IP filter applicability
for different services.
Figure 2: Example of an ATM Mirror Service
In Figure 62, CE 3 is connected to PE1 on ATM SAP 2/1/1/:0/100 as part of an IES service. The
traffic on ATM SAP 2/1/1/:0/100 is mirrored locally to CE4 device through ATM SAP 1/2/1:1/
101. In this scenario, all AAL5 packets arriving at SAP 2/1/1/:0/100 are duplicated and send
towards ATM SAP 1/2/1:1/101.
In the case where the destination ATM SAP is on a remote node PE2, then the AAL5 traffic
arriving at ATM SAP 2/1/1/:0/100 is duplicated and sent across the IP/MPLS network to PE2. At
PE2 the traffic is forwarded to ATM SAP 1/1/1:0/1000 towards the ATM traffic monitoring
device.
7750 SR
SAP 1/1/1:0/1000
IP/MPLS
PE 1
PE 2
CE 1
IP PW
7750 SR 7750 SR
ATM
SAP
2/1/1: 0/100
1/2/1:1/101
CE 2
CE 3
ATM
SAP
ATM
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