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Extra resources for Cisco Designing ATM MPLS Networks
This reduces the number of VP Tunnels required, and starts to reduce some of the scalability problems of hybrid networks. • More ATM-LSRs are added, which further reduces the number of VP tunnels, and starts to introduce native ATM MPLS links this is shown in Figure 16(c). This step naturally leads to the final one. • Ultimately, all ATM switches are ATM-LSRs, and no VP Tunnels are used at all. The full network runs ATM MPLS, and has none of the disadvantages of hybrid networks. This is illustrated in Figure 16(d).
These conditions will often apply in the core of MPLS networks supporting VPNs, but not using VC Merge. The number of LVCs used per link on the ATM Edge LSR in this case is given by: l < 2cn . (3) One of these equations is then used to check whether a sufficient number of LVCs is available on the equipment, as shown in Table 6. Table 7 shows the LVC capacity of Cisco ATM Edge LSR interfaces. Table 6 Checking the LVC limits of Edge LSR Device Situation Key Parameter Check Against Edge LSR The network uses VC merge Number of active VCs supported per ATM link.
All links in the area are unnumbered, and there are no out-of-area routes known. What limit do these ATM-LSRs put on the number of LSRs or edge LSRs which can be supported inside an area? A. Table 10 shows that Equation (7) should be checked in this case. One class of service is used, so c = 1 . Looking up the BPX 8650 in Table 9 shows that BXM cards support 16k active LVCs. In this case, each BXM card has four ports, so each link supports 16k/4 LVCs, or l = 4096 . Substituting these parameters into Equation (7) gives 4096 ≤ 1 ( n 2 ⁄ 2 ) 2 ( n ≥ 8192 ) or n > 90 .