Do we need to submit a bug to the developers of BIRD?
Frank
From: MICE Discuss <[log in to unmask]> On Behalf Of David Farmer
Sent: Thursday, April 30, 2020 8:37 AM
To: [log in to unmask]
Subject: Re: [MICE-DISCUSS] route server down?
I think it was more than just an invalid next-hop. If it was simply an invalid next-hop that shouldn't have created a malformed BGP update. Unless the invalid next-hop caused BIRD to send out a malformed BGP update.
On Thu, Apr 30, 2020 at 8:24 AM Jay Hanke <[log in to unmask]> wrote:
I emailed xcel about the invalid next-hop address.
We should filter invalid next hops on the route servers.
There also appears to be an issue with how some routers handle the
invalid next hop.
Are all the peers with the issue of losing the session to RS2 running Brocade?
On Thu, Apr 30, 2020 at 8:17 AM David Farmer <[log in to unmask]> wrote:
>
> someone with Access should see what route server 2 sees for that prefix, and maybe kick it over after look at it.
>
> On Thu, Apr 30, 2020 at 8:04 AM Jay Hanke <[log in to unmask]> wrote:
>>
>> We're seeing the same with a good next-hop from RS1.
>>
>> On Thu, Apr 30, 2020 at 7:55 AM Chris Wopat <[log in to unmask]> wrote:
>> >
>> > On 4/30/20 7:49 AM, David Farmer wrote:
>> >
>> > > We're running IOS XR, I found these droppings in our logs;
>> > >
>> >
>> > RP/0/RP0/CPU0:Apr 29 21:50:26.798 CDT: bgp[1068]:
>> > %ROUTING-BGP-3-MALFORM_UPDATE : Malformed UPDATE message received from
>> > neighbor 206.108.255.2 (VRF: default) - message length 59 bytes, error
>> > flags 0x00000200, action taken "TreatAsWdr". Error details: "Error
>> > 0x00000200, Field "Attr-data", Attribute 2 (Flags 0x40, Length 0), Data
>> > [400200]". NLRIs: [IPv4 Unicast] 198.179.154.0/23
>> > RP/0/RP1/CPU0:Apr 29 21:50:26.797 CDT: bgp[1068]:
>> > %ROUTING-BGP-3-MALFORM_UPDATE : Malformed UPDATE message received from
>> > neighbor 206.108.255.2 (VRF: default) - message length 59 bytes, error
>> > flags 0x00000200, action taken "TreatAsWdr". Error details: "Error
>> > 0x00000200, Field "Attr-data", Attribute 2 (Flags 0x40, Length 0), Data
>> > [400200]". NLRIs: [IPv4 Unicast] 198.179.154.0/23
>> > >
>> > > Maybe try resting you BGP sessions.
>> > >
>> > We're seeing a weird next-hop ip on that prefix (rfc1918) and its hidden
>> > on our net.
>> >
>> > Is 10.223.129.2 something internal to route server #2?
>> >
>> > > show route 198.179.154.0 hidden detail
>> >
>> > inet.0: 795967 destinations, 2081403 routes (795589 active, 0 holddown,
>> > 1604 hidden)
>> > 198.179.154.0/23 (3 entries, 1 announced)
>> > BGP
>> > Next hop type: Router, Next hop index: 0
>> > Address: 0x113614cc
>> > Next-hop reference count: 1
>> > Source: 206.108.255.2
>> > Next hop: 10.223.129.2 via xe-0/1/5.300, selected
>> > Session Id: 0x0
>> > State:
>> > Inactive reason: Unusable path
>> > Local AS: 65400 Peer AS: 53679
>> > Age: 10:02:05
>> > Validation State: unverified
>> > Task: BGP_53679.206.108.255.2
>> > AS path: I
>> > Communities: target:21693:1000
>> > Router ID: 206.108.255.2
>> > Hidden reason: protocol nexthop is not on the interface
>> >
>> >
>> > --
>> > Chris Wopat
>> > Network Engineer, WiscNet
>> > [log in to unmask] 608-210-3965
>>
>>
>>
>> --
>> Jay Hanke, President
>> South Front Networks
>> [log in to unmask]
>> Phone 612-204-0000
>
>
>
> --
> ===============================================
> David Farmer Email:[log in to unmask]
> Networking & Telecommunication Services
> Office of Information Technology
> University of Minnesota
> 2218 University Ave SE Phone: 612-626-0815
> Minneapolis, MN 55414-3029 Cell: 612-812-9952
> ===============================================
>
> ________________________________
>
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--
Jay Hanke, President
South Front Networks
[log in to unmask]
Phone 612-204-0000
--
===============================================
David Farmer Email:[log in to unmask]
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE Phone: 612-626-0815
Minneapolis, MN 55414-3029 Cell: 612-812-9952
===============================================
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