OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 95 of 148
references a route map
ip redist local into ospf route-map "allow" admin-state enable note: default is admin-state enable
ip redist local into bgp route-map "allow" admin-state enable
ip redist static into ospf route-map "allow" admin-state enable
ip redist static into bgp route-map "allow" admin-state enable
ip redist bgp into ospf route-map "allow" admin-state enable
Note: ip bgp network statements are an option that supports MED
Note: policy-lists provide an option to limits the advertised prefixes.
Need an IPv6 method to always advertise the /48 – Cisco null zero address equivalent for a static route with-in
a block, 4-53
Build the BGP Table - Troubleshooting Commands
show ip routes !current routing table
show ip router database !all routes/all protocols
show ip bgp routes [<ip-addr> <mask> !BGP routes
show ip bgp path !next hop & BGP attr for paths
show ip bgp path <ip-addr> <mask> !adds path detail pref, MED..
show ip bgp path neighbor-adv !show advertised routes to neighbor
Similar to Cisco show ip bpg neighbor <ip-addr advertised-routes
show ip bpg path neighbor-rcv !1
st
source – BGP
Similar to Cisco show ip brp neighbor <ip-addr> routes
show ip redist !2
nd
source – redist
show ip bgp network !3
rd
soure – network
Build BGP Route Table Route Selection:
Next Hop Reachable
Weight (Cisco proprietary)
Highest bgp local preference (default 100)
Locally injected routes (locally injected is better than i/eBGP)
Fewest autonomous systems in AS Path
AS path origin (IGP < EGP < Incomplete)
Lowest Multi-Exit Discriminator (MED)
Neighbor type (EBGP before IBGP)
IGP metric to next hop (closer is better)
Source of route (IGP <EBGP <IBGP)
Lower BGP Router ID
Oldest eBGP < smallest Neighbor RID < smallest neighbor IP
Build the Local Forwarding Table
show ip routes //forwarding table & source
show ip router database //inspect the available paths
show ip route protocol [bgp | ospf…] //aka Cisco sh ip bgp
default route preference //select the routes based on lowest
IPv4 route preference (adminstrative dist)
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