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Exam 300-410 topic 1 question 91 discussion

Actual exam question from Cisco's 300-410
Question #: 91
Topic #: 1
[All 300-410 Questions]

Which command allows traffic to load-balance in an MPLS Layer 3 VPN configuration?

  • A. multi-paths eibgp 2
  • B. maximum-paths 2
  • C. maximum-paths ibgp 2
  • D. multi-paths 2
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Suggested Answer: C 🗳️

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ZachTL11
Highly Voted 3 years, 9 months ago
C is correct. Remember MPLS Layer 3 VPN is used in an iBGP setup and not eBGP. This rules out B as the correct answer.
upvoted 15 times
wts
2 years, 4 months ago
MPLS L3VPN is used IGP/EBGP(CE-PE) and IGP+MPLS+MBGP[iBGP](PE-PE). That is why the votes are divided.
upvoted 1 times
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HungarianDish_111
Highly Voted 1 year, 7 months ago
Selected Answer: C
https://www.cisco.com/c/en/us/td/docs/ios/12_2sx/feature/guide/fsxeibmp.html#wp1037690 This is how I see this based on the mentioned article. In BGP we can set different options for load sharing, depending on the design. With MPLS, we can configure "maximum-path ibgp" or "maximum-path eibgp", where the feature [ibgp] performs multipath forwarding only in PE-PE ibgp MPLS domain, and the feature [eibgp] can use both PE-PE ibgp and PE-CE ebgp domains for multipath calculations. If "maximum-paths eibgp 2" is not offered then "maximum-paths ibgp" is OK for MPLS (PE-PE) scenarios. = Answer "C"
upvoted 5 times
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Rupirapa
Most Recent 3 weeks, 1 day ago
Selected Answer: B
The answer is B Step 8 maximum-paths [ bgp ] number-of-paths Example: switch(config-router-af)# maximum-paths 4 Configures the maximum number of multipaths allowed. Use the ibgp keyword to configure iBGP load balancing. The range is from 1 to 16. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/label-switching/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x_chapter_0111.html#concept_ytr_tk3_rbb
upvoted 1 times
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bk989
5 months, 1 week ago
answer is C: maximum-paths ibgp2. I explain now: A: "multi-path" is not existant B: maximum-paths 2 -> this is for address-family ipv4/ipv6 C: maximum-paths ibgp 2: this offers load balancing for this address-family --> address-family vpnv4 maxim-paths --> address-family ipv4/ipv6 maximum-paths ibgp/ebgp,eibgp --> address-family vpnv4/vpnv6
upvoted 1 times
bk989
5 months, 1 week ago
so for mpls we need ibgp, or eibgp to load balance the VPNv4 routes
upvoted 1 times
bk989
5 months, 1 week ago
I see now that the eibgp and ibgp maximum paths is only available under address-family ipv4 and not address-family vpnv4. Disregard my comments.
upvoted 1 times
bk989
5 months, 1 week ago
IOU2(config-router)#address-family ipv4 vrf red IOU2(config-router-af)# IOU2(config-router-af)# IOU2(config-router-af)#ma IOU2(config-router-af)#maximum-paths IOU2(config-router-af)#maximum-paths IOU2(config-router-af)#maximum-paths ? <1-32> Number of paths eibgp Both eBGP and iBGP paths as multipath ibgp iBGP-multipath IOU2(config-router-af)#maximum-paths eibgp Both eBGP and iBGP paths as multipath ibgp iBGP-multipath however this eibgp and ibgp maximum-paths is still for MPLS. maximum-paths for mpls makes no sense. anser is C.
upvoted 1 times
bk989
4 months, 2 weeks ago
answer is C according to above
upvoted 1 times
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[Removed]
6 months ago
Selected Answer: C
C is correct
upvoted 1 times
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Gramterre
9 months, 2 weeks ago
Fortunately MPLS L3 VPN is only a "describe" topic and not a "configure"...
upvoted 4 times
jabal93
5 months, 1 week ago
Ameen to that :)
upvoted 1 times
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louisvuitton12
1 year, 2 months ago
Selected Answer: C
Answer is C. https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/102x/configuration/label-switching/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-102x/m-configuring-mpls-layer-3-vpn-load-balancing.pdf Example: MPLS Layer 3 VPN Load Balancing The following example shows how to configure iBGP load balancing: configure terminal feature-set mpls feature mpls l3vpn feature bgp router bgp 1.1 bestpath cost-community ignore address-family ipv6 unicast maximum-paths ibgp 4
upvoted 4 times
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BTK0311
1 year, 4 months ago
eBGP and iBGP Multipath Load Sharing Configuration Example This following configuration example configures a router in IPv4 address-family mode to select two BGP routes (eBGP or iBGP) as multipaths: Device router bgp 40000 Deviceaddress-family ipv4 vrf RED Devicemaximum-paths eibgp 2 Deviceend This following configuration example configures a router in IPv6 address-family mode to select two BGP routes (eBGP or iBGP) as multipaths: Device router bgp 40000 Deviceaddress-family ipv6 vrf RED Devicemaximum-paths eibgp 2
upvoted 1 times
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inteldarvid
1 year, 6 months ago
Selected Answer: C
option corret is: C https://www.cisco.com/c/en/us/td/docs/ios/12_2sx/feature/guide/fsxeibmp.html The maximum-paths eibgp command used to configure Border Gateway Protocol (BGP) multipath load sharing in an Multiprotocol Label Switching (MPLS) virtual private network (VPN) using eBGP and iBGP routes. This feature is configured under a VPN routing and forwarding instance (VRF) in address family configuration mode. The number of multipaths is configured separately for each VRF. The number of paths that can be configured is determined by the version of Cisco IOS software
upvoted 2 times
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Rob_CCNP000
1 year, 7 months ago
Selected Answer: C
The command “maximum-paths [ ibgp ] number-of-paths” configures the maximum number of multipaths allowed - MPLS uses ebgp so C is correct.
upvoted 3 times
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dancott
1 year, 8 months ago
Selected Answer: C
Copied from Cisco config guide: Example: MPLS Layer 3 VPN Load Balancing The following example shows how to configure iBGP load balancing: configure terminal feature-set mpls feature mpls l3vpn feature bgp router bgp 1.1 bestpath cost-community ignore address-family ipv6 unicast maximum-paths ibgp 4
upvoted 2 times
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HungarianDish_111
1 year, 8 months ago
Why aren't they offering this answer? #address-family ipv4 vrf ... #maximum-paths eibgp 2 -if the parameter "ibgp" is optional than answer "B" might be closer https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/mpls/configuration/guide/mpls_cg/mp_vpn_multipath.html #maximum-paths [ ibgp ] "number-of-paths"
upvoted 1 times
HungarianDish_111
1 year, 7 months ago
B) #maximum-paths 2 is only for PE-CE eBGP connections outside of the MPLS domain.
upvoted 1 times
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Commando1664
1 year, 9 months ago
Summmary Steps from the article: Configuring BGP Load Balancing for eBGP and iBGP You can configure a Layer 3 VPN load balancing for an eBGP or iBGP network. Prerequisites Ensure that you are in the correct VDC (or use the switchto vdc command). SUMMARY STEPS 1. configure terminal 2. feature- s et mpls 3. feature mpls l3vpn 4. feature bgp 5. router bgp as-number 6. (Optional) bestpath cost-community ignore 7. address-family { ipv4 | ipv6 } unicast 8. maximum-paths [ibgp] number-of-paths 9. (Optional) show running-config bgp 10. (Optional) copy running-config startup-config
upvoted 1 times
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PimplePooper
2 years ago
Selected Answer: B
B is correct
upvoted 2 times
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jarz
2 years, 3 months ago
Selected Answer: C
Def. C. It's in this article from Cisco. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/mpls/configuration/guide/mpls_cg/mp_vpn_multipath.html
upvoted 2 times
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wts
2 years, 4 months ago
Selected Answer: C
First of all, the correct answer is: maximum-paths eibgp 2 . But it's not here. You have to choose between A and B. Since the iBGP(M-BGP) is deeper in the MPLS, I choose to C.
upvoted 2 times
quyle
2 years, 3 months ago
P and PE using iBGP, PE and CE using eBGP. I think A B C is also correct. I don't know :)
upvoted 1 times
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M_Abdulkarim
2 years, 4 months ago
Selected Answer: A
correct is A ==> eibgp
upvoted 1 times
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B (20%)
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