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07-09-2013 09:45 AM
07-09-2013 09:45 AM
resolve host names in show ip route output
Hi,
i am using ProCurve J8697A Switch 5406zl (Software revision K.15.03.0005).
When I issue a "show ip route" I get following output :
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
------------------ --------------- ---- --------- ---------- ---------- -----
172.20.47.96/30 ev1-dev... 2000 connected 1 0
172.21.195.128/25 10-lab-et 1047 connected 1 0
I get ev1-dev and 10-lab-et in Gateway field. Is there any way I could get these Hosts resolved to IP addresses in the same table ?
Thanks.
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07-09-2013 03:30 PM
07-09-2013 03:30 PM
Re: resolve host names in show ip route output
Those are VLAN names, not host names.
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07-09-2013 03:31 PM
07-09-2013 03:31 PM
Re: resolve host names in show ip route output
Add in some static routes (ie, not "connected" subnets) and the IP address of the target interface will come up.
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07-10-2013 07:46 AM
07-10-2013 07:46 AM
Re: resolve host names in show ip route output
Thanks Vince_Whirlwind.
1. So these VLANS are configured on the next Hop right and not the local ones since its the Gateway.
2. ALso
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
------------------ --------------- ---- --------- ---------- ---------- -----
172.20.47.96/30 ev1-dev... 2000 connected 1 0
172.21.195.128/25 10-lab-et 1047 connected 1 0
then what are 2000 and 1047 VLANS here for ?
These VLANs (2000 and 1047) are the outgoing interface(virtual ones) right ? so a packet matching rule 172.21.195.128/25 will use one of the physical interfaces belonging to1047 VLAN as the outgoing interface right.
3. the gateway lo0 points to 127.0.0.1 .
For the below entry :
172.20.19.150/32 lo0 connected 1 0
Gateway is lo0 so does that mean packets destined to 172.20.19.150/32 should be dropped ?
4. Also most important question : how is forwarding done in these switches ? does the switch refer output of "show ip route " to make those decisions or there is another forwarding table in ProCurve J8697A Switch 5406zl (Software revision K.15.03.0005).
Thanks.
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07-10-2013 04:28 PM
07-10-2013 04:28 PM
Re: resolve host names in show ip route output
1/ I'm not sure I understand - the routes you displayed are connected routes. They are local routes the router has legs into therefore has added to its routing table automatically.
2/ The VLAN ID is displayed alongside the target for the route. In this case, the target is a locally-connected VLAN, so the target is the same VLAN, by name. And yes, of you have a packet destined for 172.21.195.128/25, then it will go out VLAN 1047.
3/ Presumably you have configured your L0 interface with the IP address 172.20.19.150.
4/ show mac-address?
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07-12-2013 09:56 AM
07-12-2013 09:56 AM
Re: resolve host names in show ip route output
Thanks Vince_Whirlwind
1 ignore this question
3. how can I find address configured on L0 interface. I used "show interfaces brief" and "show ip" but can not find the L0 interface. what command do we use to get all IP address configured on the box. isn't it show ip ?
4. I mean lets say we have packet with destination x.x.x.x which needs to be forwaded so does the switch refer "show ip route" table or some other table.
like in CIsco we have show ip route but switches have Cisco Express forwarding which are like FIBs used for making forwarding decision.
SImilarly for juniper even though we have show route but they have Juniper PFE table which they use for forwarding.
In short if we lets say if the switch has learned 2 routes to same destination from 2 different protocols but it would use only one route from it and store in forwarding information base. I am looking for FIB table.