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  • 1.  Subscriber BGP session (routing-service )

    Posted 12 days ago

    Hello community!
    Model: mx80-t
    Junos: 20.2R1-S2.1
    There was a need to setup a bgp multihop session with a subscriber with dhcp static lease. According to the documentation, I need to add to the configuration to dynamic-profile "routing-service enable" stanza in vlan and demux profiles. My configuration:
    vlan profile

    VLAN_RANGE_ANY_RS {
    interfaces {
        "$junos-interface-ifd-name" {
            unit "$junos-interface-unit" {
                actual-transit-statistics;
                demux-source inet;
                routing-service {
                    enable;
                }                       
                proxy-arp;
                vlan-tags outer "$junos-vlan-id";
                demux-options {
                    underlying-interface "$junos-interface-ifd-name";
                }
                family inet {
                    unnumbered-address lo0.0 preferred-source-address x.x.x.x;
                }
            }
        }
    }
}


    dhcp profile

    INTERNET {
    routing-instances {
        "$junos-routing-instance" {
            interface "$junos-interface-name" {
                any;
            }
            routing-options {
                access {
                    route $junos-framed-route-ip-address-prefix next-hop "$junos-framed-route-nexthop";
                }
            }
        }
    }
    interfaces {
        demux0 {
            unit "$junos-interface-unit" {
                routing-service {
                    enable;
                }
                demux-options {
                    underlying-interface "$junos-underlying-interface";
                }
                family inet {
                    demux-source {
                        $junos-subscriber-ip-address;
                    }
                    unnumbered-address "$junos-loopback-interface" preferred-source-address "$junos-preferred-source-address";
                }
            }
        }
    }
}


    also to this subscriber has activated service with policer only. vlan interface create correctly, but demux0.xxxxxxxx not created with error:
    May 16 11:55:22  rtestroom-1 jdhcpd: NACK received for profile request with id=0x3d70df0 from bbe-smgd daemon: Failed to create pseudo ifl retry TRUE result 0x00000034
    if i remove "routing-service" from dhcp profile - all work correctly, bgp session is up, but received route from peer does not have a next-hop 

    > show route 10.254.197.0 

10.254.197.0/24    *[BGP/170] 00:01:28, localpref 100, from RR1
                      AS path: 65530 I, validation-state: unverified
                    >
                    [BGP/170] 00:01:28, localpref 100, from RR2
                      AS path: 65530 I, validation-state: unverified
                    >

> show route 10.254.197.0 extensive          

inet.0: 1688 destinations, 3474 routes (1688 active, 0 holddown, 4 hidden)
10.254.197.0/24 (2 entries, 1 announced)
TSI:
KRT in-kernel 10.254.197.0/24 -> {indirect(1048643)}
        *BGP    Preference: 170/-101
                Next hop type: Indirect, Next hop index: 0
                Address: 0x59d1e94
                Next-hop reference count: 3
                Source: RR1
                Next hop type: Private unicast, Next hop index: 0
                Next hop: , selected
                Protocol next hop: Subscriber_IP
                Indirect next hop: 0x5af0704 1048643 INH Session ID: 0x185
                State: <Active Int Ext>
                Local AS: ... Peer AS: ...
                Age: 2:54 	Metric2: 0 
                Validation State: unverified 
                Task: ...
                Announcement bits (2): 0-KRT 7-Resolve tree 3 
                AS path: 65530 I  (Originator)
                Cluster list:  RR1
                Originator ID: BGP_PEER
                Accepted
                Localpref: 100
                Router ID: RR1
                Indirect next hops: 1
                        Protocol next hop: Subscriber_IP
                        Indirect next hop: 0x5af0704 1048643 INH Session ID: 0x185
                        Indirect path forwarding next hops: 1
                                Next hop type: Private unicast
                                Next hop: 
                               Subscriber_IP/32 Originating RIB: inet.0
                                  Node path count: 1
                                  Forwarding nexthops: 1
                                        Next hop type: Private unicast
                                        Next hop:


    and no connectivity to host in network 10.254.197.0/24... 
    how to use parameter "routing-service" correctly?



  • 2.  RE: Subscriber BGP session (routing-service )

    Posted 11 days ago

    Have no real experience with this feature, just an advice to try to look in shmlogs. It's very obscure and almost undocumented but with right filters applied to a right log it can help to find the root cause.


    Original Message