是否可以通过 SNMP 在 IOS-XR 路由器中获取 L2VPN xconnect 状态？它应该有 7 种可能的状态（Up、Down、Admin Down、Unresolved、Standby、Standby Ready、Partially Programmed）：

RP/0/RSP0/CPU0:r1#show l2vpn xconnect group TEST-GROUP xc-name TEST-XCONNECT        
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
        SB = Standby, SR = Standby Ready, (PP) = Partially Programmed

XConnect                   Segment 1                       Segment 2                
Group      Name       ST   Description            ST       Description            ST    
------------------------   -----------------------------   -----------------------------
TEST-GROUP TEST-XCONNECT
                      UP   Gi0/1/0/1.2            UP       192.0.2.27   2110   UP    
----------------------------------------------------------------------------------------
RP/0/RSP0/CPU0:r1#

至少例如不支持在 IOS-XR 中通过 SNMP 轮询伪线数据包统计信息。