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  • 1.  Subscriber BGP session (routing-service )

    Posted 05-16-2023 05:31

    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 05-17-2023 09:11

    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