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  • 1.  Need assistance for GRE tunnel interface IPv6 link-local address

    Posted 02-26-2021 13:49
    I have two vMX routers with GRE connection.

    set logical-systems SRX3 interfaces gr-0/0/10 unit 0 tunnel source 172.30.15.3
    set logical-systems SRX3 interfaces gr-0/0/10 unit 0 tunnel destination 172.30.15.1
    set logical-systems SRX3 interfaces gr-0/0/10 unit 0 family inet address 172.30.0.130/30
    set logical-systems SRX3 interfaces gr-0/0/10 unit 0 family inet6 address fd17:f0f4:f691:3::6/126

    set interfaces gr-0/0/10 unit 0 tunnel source 172.30.15.1
    set interfaces gr-0/0/10 unit 0 tunnel destination 172.30.15.3
    set interfaces gr-0/0/10 unit 0 family inet address 172.30.0.129/30
    set interfaces gr-0/0/10 unit 0 family inet6 address fd17:f0f4:f691:3::5/126

    GRE works fine.
    On both routers, I have ospf3 configurations as follows:

    root@SRX1-ISP1# show | display set | match ospf3 | match gr-0/0
    set protocols ospf3 realm ipv4-unicast area 0.0.0.3 interface gr-0/0/10.0 interface-type p2p
    set protocols ospf3 area 0.0.0.3 interface gr-0/0/10.0 interface-type p2p

    root@SRX3-SRX4# show logical-systems | display set | match ospf3 | match gr-0/0
    set logical-systems SRX3 protocols ospf3 realm ipv4-unicast area 0.0.0.3 interface gr-0/0/10.0 interface-type p2p
    set logical-systems SRX3 protocols ospf3 area 0.0.0.3 interface gr-0/0/10.0 interface-type p2p

    I got the following from traceoptions:

    Feb 26 08:26:09.608565 OSPF rcvd Hello fe80::200:0:2800:0 -> ff02::5 (gr-0/0/10.0 IFL 340 area 0.0.0.3)

    Feb 26 08:26:09.608571   Version 3, length 36, ID 172.30.15.3, area 0.0.0.3

    Feb 26 08:26:09.608575   checksum 0x0, instance-id 0

    Feb 26 08:26:09.608587   intf_id 0.0.0.5, prio 128, opts 0x13, hello_ivl 10

    Feb 26 08:26:09.608591   dead_ivl 40, DR 0.0.0.0, BDR 0.0.0.0

    Feb 26 08:26:09.608609 OSPF packet ignored: our interface address is source address fe80::200:0:2800:0 on intf gr-0/0/10.0 area 0.0.0.3

    Feb 26 08:26:11.623628 task_process_events: recv ready for OSPF3 I/O./var/run/ppmd_control

    Feb 26 08:26:11.623680 task_process_events: recv ready for OSPF3 I/O./var/run/ppmd_control

    Feb 26 08:26:11.623696 task_timer_uset: timer OSPF3 I/O./var/run/ppmd_control_PPM Hold <Touched> set to offset 2:00 at 8:28:11.623680

    Feb 26 08:26:11.623719 Received OSPF packet of type and wire_length 1, 40

     

    root@SRX3-SRX4# run show interfaces gr-0/0/10 terse

    Interface               Admin Link Proto    Local                 Remote

    gr-0/0/10               up    up

    gr-0/0/10.0             up    up   inet     172.30.0.130/30

                                       inet6    fd17:f0f4:f691:3::6/126

                                                fe80::200:0:2800:0/64

     

    root@SRX1-ISP1# run show interfaces gr-0/0/10 terse

    Interface               Admin Link Proto    Local                 Remote

    gr-0/0/10               up    up

    gr-0/0/10.0             up    up   inet     172.30.0.129/30

                                       inet6    fd17:f0f4:f691:3::5/126

                                                fe80::200:0:2800:0/64

    I noticed both link-local addresses are the same. Do you think I need to manually configure link-local address on gre itnerfaces ?

    thanks in advance !!!



  • 2.  RE: Need assistance for GRE tunnel interface IPv6 link-local address

    Posted 02-28-2021 07:29
    The link local addresses are only used by the local link devices that are connected.  So they are locally agreed upon and it makes no difference if they are reused in other parts of the network.

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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
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