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Chapter 23
Configuring BXM Virtual Switch Interface
Table 23-16 Service Class Template Default Settings (continued)
Parameter with Default Setting Label
Trm
VC Qdepth
CLP Hi
CLP Lo / EPD
EFCI
RIF
RDF
Nrm
FRTT
TBE
IBS
CAC Treatment
Scaling Class
CDF
Understanding MPLS VC Merge
Virtual Circuit (VC) merge improves the scalability of MPLS networks and allows multiple incoming
VCs to be merged into a single outgoing VC, which is called merged VC. Tag switching is supported. In
the BPX 8600 series switch, VC Merge is implemented as part of the output buffering for ATM
interfaces.
Note
The enhanced BXM (BXM-E) cards are required by VC Merge.
Only frame-based connections are implemented. While preserving AAl5 framing, the key to VC Merge
is to switch cells from the merging Label Virtual Circuit (LVC) to the merged LVC that points to the
destination. An AAL5 frame consists of multiple cells. The cells from a particular frame must be in an
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Tag0–7: N/A
TagAbr: 0
61440
100
40
TagAbr: 20
Tag0–7: N/A
TagAbr: 16
Tag0–7: N/A
TagAbr: 16
Tag0–7: N/A
TagAbr: 32
Tag0–7: N/A
TagAbr: 0
Tag0–7: N/A
TagAbr: 16,777,215
N/A
LCN
UBR – Scaled 1st
16
Cisco BPX 8600 Series Installation and Configuration
Understanding MPLS VC Merge
PNNI
ABR: 100
10,000
160–cbr
1280–vbr
80
35
20 (not valid for non-ABR)
ABR: 16
ABR: 16
ABR: 32
ABR: 0
ABR: 16,777,215
N/A
VBR: CAC4
UBR:LCN
ABR: MIN BW
CBR: CAC4
VBR: VBR –Scaled 3rd
UBR: UBR – Scaled 1st
ABR: ABR – Scaled 2nd
CBR: CBR – Scaled 4th
16
23-39
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Troubleshooting
