shoot backtrack backtrack
Brian is correct didn't realise after you removed the static null0 that
it's still E2
Metric Type: 2 (Larger than any link state path)
ignore my nonsense
On 11 April 2013 23:07, Brian Dennis <bdennis_at_ine.com> wrote:
> It's kind of hard to be sure as there appears to be information
> missing/incorrect below BUT if an E1 route is being learned across the
> MPLS "super backbone" then that means its probably, assuming no SHAM link,
> in the PE's RIB as iBGP which has an admin distance of 200. This iBGP
> route is then redistributed into OSPF as an E1. If the E2 route is
> learned via OSPF by the same PE it will have an admin distance of 110.
> This would overtake the iBGP route and in turn would stop the E1 from
> being redistributed into OSPF on the PE.
>
> Also in your case below the OSPF route from R4 (PE) isn't an E1 but an E2:
>
> Routing Bit Set on this LSA
> LS age: 55
> Options: (No TOS-capability, DC)
> LS Type: AS External Link
> Link State ID: 12.12.12.12 (External Network Number )
> Advertising Router: 0.0.0.4
> LS Seq Number: 80000001
> Checksum: 0xF046
> Length: 36
> Network Mask: /32
> Metric Type: 2 (Larger than any link state path) <--- E2
> TOS: 0
> Metric: 20
> Forward Address: 0.0.0.0
> External Route Tag: 3489661028
>
>
> --
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com
>
> INE, Inc.
> http://www.INE.com
>
>
>
> On 4/11/13 2:03 PM, "bitje" <lj_at_cli.nu> wrote:
>
> >Hi,
> >
> >I have a situation where a E1 route is being overriden by a E2 route.
> >The E1 route is entering the area from a mpls superbackbone and the
> >E2 from an ASBR in the same area. According to what I know an E1
> >route should always win from a E2 route.. I feel that I am going
> >to learn something here.
> >
> >R5 is connected to SW2 and R4.
> >
> >On SW2 the following is done:
> >!
> >ip route 12.12.12.12 255.255.255.255 Null0
> >!
> >router ospf 100
> > router-id 0.0.0.8
> > log-adjacency-changes
> > redistribute static subnets
> > network 155.1.58.8 0.0.0.0 area 0
> >!
> >
> >On R4 the following is done:
> >!
> >router ospf 100 vrf TEST
> > router-id 0.0.0.4
> > log-adjacency-changes
> > redistribute bgp 100 subnets
> > network 155.1.45.4 0.0.0.0 area 0
> >!
> >router bgp 100
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 6.6.6.6 remote-as 100
> > neighbor 6.6.6.6 update-source Loopback10
> > neighbor 204.12.1.254 remote-as 54
> > no auto-summary
> > !
> > address-family vpnv4
> > neighbor 6.6.6.6 activate
> > neighbor 6.6.6.6 send-community extended
> > exit-address-family
> > !
> > address-family ipv4 vrf TEST
> > no synchronization
> > exit-address-family
> >!
> >
> >On R5 the following is done:
> >!
> >router ospf 100
> > router-id 0.0.0.5
> > log-adjacency-changes
> > network 155.1.45.5 0.0.0.0 area 0
> > network 155.1.58.5 0.0.0.0 area 0
> >Rack1R5#
> >
> >Some relevant show commands:
> >
> >Rack1R5#show ip route ospf 100
> > 12.0.0.0/32 is subnetted, 1 subnets
> >O E2 12.12.12.12 [110/20] via 155.1.58.8, 05:41:13, FastEthernet0/0
> >Rack1R5#
> >
> >Rack1R5#show ip ospf database external 12.12.12.12
> >
> > OSPF Router with ID (0.0.0.5) (Process ID 100)
> >
> > Type-5 AS External Link States
> >
> > Routing Bit Set on this LSA
> > LS age: 1494
> > Options: (No TOS-capability, DC)
> > LS Type: AS External Link
> > Link State ID: 12.12.12.12 (External Network Number )
> > Advertising Router: 0.0.0.8
> > LS Seq Number: 8000000B
> > Checksum: 0x79E4
> > Length: 36
> > Network Mask: /32
> > Metric Type: 2 (Larger than any link state path)
> > TOS: 0
> > Metric: 20
> > Forward Address: 0.0.0.0
> > External Route Tag: 0
> >
> >Rack1R5#
> >
> >Rack1R5#show ip ospf database router 0.0.0.8
> >
> > OSPF Router with ID (0.0.0.5) (Process ID 100)
> >
> > Router Link States (Area 0)
> >
> > Routing Bit Set on this LSA
> > LS age: 1533
> > Options: (No TOS-capability, DC)
> > LS Type: Router Links
> > Link State ID: 0.0.0.8
> > Advertising Router: 0.0.0.8
> > LS Seq Number: 80000024
> > Checksum: 0xDF9B
> > Length: 36
> > AS Boundary Router
> > Number of Links: 1
> >
> > Link connected to: a Transit Network
> > (Link ID) Designated Router address: 155.1.58.5
> > (Link Data) Router Interface address: 155.1.58.8
> > Number of TOS metrics: 0
> > TOS 0 Metrics: 200
> >
> >
> >Rack1R5#
> >
> >Now if I remove the static route on SW2:
> >Rack1SW2(config)#no ip route 12.12.12.12 255.255.255.255 Null0
> >
> >And ask R5 what external route it has we see that only after
> >the static from SW2 has been removed R5 will accept the E1
> >route since the E2 route is no longer available:
> >
> >Rack1R5#show ip ospf database external
> >
> > OSPF Router with ID (0.0.0.5) (Process ID 100)
> >
> > Type-5 AS External Link States
> >
> > Routing Bit Set on this LSA
> > LS age: 55
> > Options: (No TOS-capability, DC)
> > LS Type: AS External Link
> > Link State ID: 12.12.12.12 (External Network Number )
> > Advertising Router: 0.0.0.4
> > LS Seq Number: 80000001
> > Checksum: 0xF046
> > Length: 36
> > Network Mask: /32
> > Metric Type: 2 (Larger than any link state path)
> > TOS: 0
> > Metric: 20
> > Forward Address: 0.0.0.0
> > External Route Tag: 3489661028
> >
> >Rack1R5#
> >
> >Rack1R5#show ip ospf database router 0.0.0.4
> >
> > OSPF Router with ID (0.0.0.5) (Process ID 100)
> >
> > Router Link States (Area 0)
> >
> > Routing Bit Set on this LSA
> > LS age: 820
> > Options: (No TOS-capability, DC)
> > LS Type: Router Links
> > Link State ID: 0.0.0.4
> > Advertising Router: 0.0.0.4
> > LS Seq Number: 80000016
> > Checksum: 0xAB3C
> > Length: 48
> > Area Border Router
> > AS Boundary Router
> > Number of Links: 2
> >
> > Link connected to: another Router (point-to-point)
> > (Link ID) Neighboring Router ID: 0.0.0.5
> > (Link Data) Router Interface address: 155.1.45.4
> > Number of TOS metrics: 0
> > TOS 0 Metrics: 64
> >
> > Link connected to: a Stub Network
> > (Link ID) Network/subnet number: 155.1.45.0
> > (Link Data) Network Mask: 255.255.255.0
> > Number of TOS metrics: 0
> > TOS 0 Metrics: 64
> >
> >
> >Rack1R5#
> >
> >Your analysis/help is appreciated.
> >
> >Regards
> >
> >
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> >
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Received on Thu Apr 11 2013 - 23:24:19 ART
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