CSC

If you are running CSC in MPLS, there are 3 labels in the carrier PE router, which in th follow show result in junos. Before we see the labe swap, This Scenario is Customer Carrier Running MPLS VPN. The backbone Carrier will not see the CE1 & Ce9 routes. this wil reduce Carrier's routing table.

The simple topology is

CE1---R1--R2--R3--R4--R5--R6--R7--R8--R9--CE9

R1,R2,R3 are AS 1
R4,R5,R6 are carrier
R7,R8,R9 are AS 3



R1
bgp.l3vpn.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

3:9:192.168.110.1/32
*[BGP/170] 05:27:51, localpref 100, from 123.123.2.2
AS path: 3 10 I
> to 123.123.12.2 via fe-0/1/0.12, Push 100016, Push 100112(top)


R2
100112 *[LDP/9] 05:24:01, metric 1
> to 123.123.23.3 via fe-0/1/0.23, Swap 100160


R3
100160 *[LDP/9] 05:24:30, metric 1
> to 123.123.34.4 via fe-0/1/0.34, Swap 100144

R4
100144 *[VPN/170] 05:24:49, metric2 1, from 1.1.5.5
> to 1.1.45.5 via fe-0/1/0.45, Swap 100112, Push 100048(top)

R5
100048 *[LDP/9] 05:25:03, metric 1
> to 1.1.56.6 via fe-0/1/0.56, Pop
100048(S=0) *[LDP/9] 05:25:03, metric 1
> to 1.1.56.6 via fe-0/1/0.56, Pop


R6
100112 *[VPN/170] 05:25:46
> to 1.1.67.7 via fe-0/1/0.67, Swap 100208


R7
100208 *[VPN/170] 05:26:05
> to 2.2.78.8 via fe-0/1/0.78, Swap 100112

R8
100112 *[LDP/9] 05:26:20, metric 1
> to 2.2.89.9 via fe-0/1/0.89, Pop
100112(S=0) *[LDP/9] 05:26:20, metric 1
> to 2.2.89.9 via fe-0/1/0.89, Pop


R9
100016 *[VPN/170] 05:31:28
> to 192.168.90.11 via fe-0/1/0.888, Pop