EIGRP - switch acting like stub, but is not stub.

Jason Vanlandingham · ‎05-25-2016

Topology:

Two routers, R1 (2951) and R2 (1921) are connected to a core stacked pair 3850.

Currently, only R2 has an active WAN connection. It is cellular running BGP. R1, Core, R2 all run EIGRP. R1 doesn't have anything on the other side of it. (R1 will soon have a microwave link out, running EIGRP)

Loopbacks - Core: 10.1.1.0/32 R1: 10.1.1.1/32 R2: 10.1.1.2/32

Core owns a few subnets and has routes to R1's loopback and R2's loopback and 0.0.0.0 just fine.

R2 has routes to everything EXCEPT loopback of R1.

R1 has routes only to Core's looback and subnets, doesn't have a 0.0.0.0.

All devices have their EIGRP neighbors established.

It looks for all the world like Core is operating as EIGRP stub, but stub is not in the config. What is going on here?

Philip D'Ath · ‎05-25-2016

Have you perhaps got an "IP Base" licence instead of "IP Services". IP Base only enables EIGRP stub.

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/qa_c67-722110.html

able 2. Cisco IOS Software Feature Set Differences

Functions

LAN Base

IP Base

IP Services

Layer 2+

Enterprise access Layer 2

Wide range of Layer 2 access features for enterprise deployments supports Cisco StackPower technology

Complete Access Layer 2

Supports all Cisco Catalyst 2000 and Cisco Catalyst 3000 Layer 2 features, including hot standby protocols

Layer 3

Static IP routing support

Support for SVI

Enterprise access Layer 3

RIP, EIGRP stub, OSPF for routed access, PBR, IPv4 & IPv6 EIGRP stub routing, WCCP, IPV6 uRPF, IPV6 PBR, VRRPv3, Policy Classification Engine, HSRP v6

Complete access Layer 3

OSPF, EIGRP, BGP, IS-IS

VRF-lite

Jason Vanlandingham · ‎05-25-2016

Sorry, I meant to post the license but forgot.

sho lic right-to-use
Slot# License name Type Count Period left
----------------------------------------------------------
1 ipservices permanent N/A Lifetime

License Level on Reboot: ipservices

Slot# License name Type Count Period left
----------------------------------------------------------
2 ipservices permanent N/A Lifetime

License Level on Reboot: ipservices

Philip D'Ath · ‎05-25-2016

Perhaps try "no eigrp stub".

Are you using the older "router eigrp xxx" configuration or the newer "named" eigrp configuration method?

Philip D'Ath · ‎05-25-2016

If you want to convert to the newer "named" eigrp configuration method check out the "eigrp upgrade-cli" command under "router eigrp xxx".

Philip D'Ath · ‎05-25-2016

Was this switch always "ip services", or was it upgraded from a lower licence level?

Jason Vanlandingham · ‎05-25-2016

IP Services out of the box.

paul driver · ‎05-25-2016

Hello

sh ip protocols
sh ip route eigrp
sh ip eigrp neigbours

res

Paul

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Paul Chapman · ‎05-25-2016

Hi -

What makes you think that the core is acting like a stub? Please post show commands that support your theory.

PSC

Jason Vanlandingham · ‎05-26-2016

By "acting like a stub" I just meant that routes do not appear to be passed through the switch between the routers, but the switch's own routes are showing up on both routers. I'll get the other details in a bit.

Richard Burts · ‎05-26-2016

Perhaps you would post the router eigrp config from all three devices? And also post show ip interface brief? This might give some insight into the issue.

HTH

Rick

HTH

Rick

Jason Vanlandingham · ‎05-26-2016

R1
router eigrp 1
network 10.0.0.0
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet0/1
no passive-interface GigabitEthernet0/2

GigabitEthernet0/0 10.1.2.138 YES NVRAM up up
GigabitEthernet0/1 10.1.1.130 YES NVRAM up up
GigabitEthernet0/2 10.1.1.134 YES NVRAM up up
Loopback0 10.1.1.1 YES NVRAM up up

CORE
router eigrp 1
network 10.0.0.0
passive-interface default
no passive-interface GigabitEthernet1/0/1
no passive-interface GigabitEthernet1/0/24
no passive-interface GigabitEthernet2/0/1
no passive-interface GigabitEthernet2/0/24

GigabitEthernet1/0/1 10.1.1.129 YES NVRAM up up
GigabitEthernet1/0/24 10.1.1.137 YES NVRAM up up
GigabitEthernet2/0/1 10.1.1.133 YES NVRAM up up
GigabitEthernet2/0/24 10.1.1.141 YES NVRAM up up
Loopback0 10.1.1.0 YES NVRAM up up

R2

router eigrp 1
network 10.0.0.0
redistribute bgp xxxxx metric 10000 10 255 10 1500
distance eigrp 18 19
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet0/1

GigabitEthernet0/0 10.1.1.138 YES manual up up
GigabitEthernet0/1 10.1.1.142 YES manual up up
Cellular0/1/0 10.2.8.60 YES IPCP up up
Loopback0 10.1.1.2 YES manual up up
Tunnel12 10.2.12.60 YES NVRAM up up

Jason Vanlandingham · ‎05-26-2016

On the core...

SHOW IP PROTOCOLS
*** IP Routing is NSF aware ***

Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)

Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Router-ID: 10.1.1.0
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1

Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
10.0.0.0
Routing Information Sources:
Gateway Distance Last Update
10.1.1.142 90 1w5d
10.1.1.138 90 1w5d
10.1.1.134 90 1w5d
10.1.1.130 90 1w5d
Distance: internal 90 external 170

SHOW IP EIGRP NE
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
3 10.1.1.142 Gi2/0/24 14 1w6d 5 100 0 188
2 10.1.1.138 Gi1/0/24 11 1w6d 1 100 0 189
1 10.1.1.134 Gi2/0/1 10 1w6d 4 100 0 50
0 10.1.1.130 Gi1/0/1 10 1w6d 3 100 0 49

SHOW IP ROUTE (only showing a few relevant lines)
Gateway of last resort is 10.1.1.142 to network 0.0.0.0

D*EX 0.0.0.0/0 [170/258816] via 10.1.1.142, 1w5d, GigabitEthernet2/0/24
[170/258816] via 10.1.1.138, 1w5d, GigabitEthernet1/0/24
10.0.0.0/8 is variably subnetted, 27 subnets, 6 masks
......................
D 10.1.2.136/30
[90/3072] via 10.1.1.134, 1w6d, GigabitEthernet2/0/1
[90/3072] via 10.1.1.130, 1w6d, GigabitEthernet1/0/1
D EX 10.1.1.0/22
[170/258816] via 10.1.1.142, 1w6d, GigabitEthernet2/0/24
[170/258816] via 10.1.1.138, 1w6d, GigabitEthernet1/0/24
D 10.1.1.1/32
[90/130816] via 10.1.1.134, 1w6d, GigabitEthernet2/0/1
[90/130816] via 10.1.1.130, 1w6d, GigabitEthernet1/0/1
D 10.1.1.2/32
[90/130816] via 10.1.1.142, 1w6d, GigabitEthernet2/0/24
[90/130816] via 10.1.1.138, 1w6d, GigabitEthernet1/0/24
.............................

Jason Vanlandingham · ‎05-26-2016

On R2...

#SHOW IP PROTOCOLS
*** IP Routing is NSF aware ***

Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)

Routing Protocol is "nhrp"
Maximum path: 32
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 250)

Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
Redistributing: bgp 65282
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
Router-ID: 10.1.1.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 18 external 19
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1

Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
10.0.0.0
Routing Information Sources:
Gateway Distance Last Update
10.1.1.141 18 1w6d
10.1.1.137 18 1w6d
10.1.1.129 18 5w1d
Distance: internal 18 external 19

Routing Protocol is "bgp XXXXX"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
IGP synchronization is disabled
Automatic route summarization is disabled
Unicast Aggregate Generation:
10.1.1.0/22 summary-only
Neighbor(s):
Address FiltIn FiltOut DistIn DistOut Weight RouteMap
10.2.12.1 WAN_IN
10.2.12.2 WAN_IN
Maximum path: 1
Routing Information Sources:
Gateway Distance Last Update
10.2.12.1 20 1w5d
10.2.12.2 20 1w5d
Distance: external 20 internal 200 local 200

#SHOW IP ROUTE EIGRP
Gateway of last resort is 10.2.12.1 to network 0.0.0.0

10.0.0.0/8 is variably subnetted, 23 subnets, 6 masks
D 10.1.1.0/32
[18/130816] via 10.1.1.141, 1w6d, GigabitEthernet0/1
[18/130816] via 10.1.1.137, 1w6d, GigabitEthernet0/0
D 10.1.1.128/30
[18/3072] via 10.1.1.141, 1w6d, GigabitEthernet0/1
[18/3072] via 10.1.1.137, 1w6d, GigabitEthernet0/0
D 10.1.1.132/30
[18/3072] via 10.1.1.141, 1w6d, GigabitEthernet0/1
[18/3072] via 10.1.1.137, 1w6d, GigabitEthernet0/0
D 10.103.177.0/24
[18/3072] via 10.1.1.141, 1w6d, GigabitEthernet0/1
[18/3072] via 10.1.1.137, 1w6d, GigabitEthernet0/0
D 10.103.178.0/24
[18/3072] via 10.1.1.141, 1w6d, GigabitEthernet0/1
[18/3072] via 10.1.1.137, 1w6d, GigabitEthernet0/0

#SHO IP EIGRP NE
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 10.1.1.141 Gi0/1 13 1w6d 4 100 0 87
0 10.1.1.137 Gi0/0 12 2w0d 5 100 0 88

Jason Vanlandingham · ‎05-26-2016

On R1...

#SHOW IP PROTOCOLS
*** IP Routing is NSF aware ***

Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)

Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 10.1.1.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1

Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
10.0.0.0
Routing Information Sources:
Gateway Distance Last Update
10.1.1.133 90 1w6d
10.1.1.129 90 1w6d
Distance: internal 90 external 170

1#SHOW IP EIGRP NE
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 10.1.1.133 Gi0/2 11 2w0d 8 100 0 85
0 10.1.1.129 Gi0/1 13 2w0d 6 100 0 86

#SHOW IP ROUTE EIGRP
Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 12 subnets, 3 masks
D 10.1.1.0/32
[90/130816] via 10.1.1.133, 2w0d, GigabitEthernet0/2
[90/130816] via 10.1.1.129, 2w0d, GigabitEthernet0/1
D 10.1.1.136/30
[90/3072] via 10.1.1.133, 2w0d, GigabitEthernet0/2
[90/3072] via 10.1.1.129, 2w0d, GigabitEthernet0/1
D 10.1.1.140/30
[90/3072] via 10.1.1.133, 2w0d, GigabitEthernet0/2
[90/3072] via 10.1.1.129, 2w0d, GigabitEthernet0/1
D 10.1.177.0/24
[90/3072] via 10.1.1.133, 2w0d, GigabitEthernet0/2
[90/3072] via 10.1.1.129, 2w0d, GigabitEthernet0/1
D 10.1.178.0/24
[90/3072] via 10.1.1.133, 2w0d, GigabitEthernet0/2
[90/3072] via 10.1.1.129, 2w0d, GigabitEthernet0/1